Moving all your const s to the right as CarloWood explained helps because then you can do the replacement in your head. Difference between constant pointer, the pointer to constant and both pointer to constant and constant pointer Constant Pointers: A constant pointer is a pointer that cannot change the address its holding. A constant pointer is a pointer that cannot change the address its holding. Thus sometimes it makes sense to use both keywords in the declaration of a single variable or pointer. NullPointerException is Runtime exception thrown when a reference variable where the existing pointing object is no more being accessed/ De-refe. Introduction: Emertxe is the leading training institute in Bangalore for Embedded Systems and IoT domains. A constant pointer is declared as : int *const ptr ( the location of const make the pointer ptr as constant pointer). Now if we try to point the pointer to some other variable (or try to make the pointer store address of some other variable), then constant pointers are incapable of this. What is a const pointer CPP? A constant pointer is declared as follows : Obviously, the difference between the two is the position of const. By using our site, you When the above code is compiled & run, we are getting the output as shown in the below figure. If you are having any problem in deciphering complex pointer declarations like. int * const ptr > ptr is constant pointer. Note 3: This trick is for all the newbies for the C programming world , who are confusing with constant& pointers. The concept originated with the studies by Archimedes of the usage of levers . You can change the value at the location pointed by pointer p, but you can not change p to point to other location.int const * ptr > ptr is a pointer to a constant. taqueria azteca broadway. I am a software engineer with passion towards programming, eager to explore web technologies, android, data warehousing and windows application development. Pointer. As the name itself indicates that the value of the variable to which the pointer is pointing is constant in other words a pointer through which one cannot change the value of variable it points is known as a pointer to constant. From the above figure, one can understand that the address where the pointer is containing can be changed but not the value. From the above fig, it is clear that at line no. A pointer to a constant is declared as : const int *ptr (the location of 'const' makes the pointer 'ptr' as a pointer to constant. This means they cannot change the value of the variable whose address they are holding. code snippets provided here is tested with GCC compiler [ gcc version 4.8.2 ] running under Linux environment. Let us consider the code snippet to understand how constant pointer works. Emertxe Placements in Embedded Systems and Embedded IoT 2022 (Jan-sept) Report, Free Online Internships in Embedded Systems Launch, Deccan Herald News Item about Emertxes Free Internship Program, Emertxes Online Training Programs in Embedded Systems & IoT, Difference between Embedded System programming and IoT programming. Is MethodChannel buffering messages until the other side is "connected"? Similarly, we can have both pointer to constant & constant pointer in a single statement. A constant pointer is declared as : int *const ptr ( the location of 'const' make the pointer 'ptr' as constant pointer) 2) Pointer to Constant : These type of pointers are the one which cannot change the value they are pointing to. we defined a pointer to a constant which points to variable var1, Now, through this pointer we tried to change the value of var1. Your Message. A constant pointer is declared as : int *const ptr( the location of 'const' make the pointer 'ptr' as constant pointer) 2) Pointer to Constant :These type of pointers are the one which cannot change the value they are pointing to. whenComplete() method not working as expected - Flutter Async, iOS app crashes when opening image gallery using image_picker. Function Pointers point to code like normal pointers . This means they cannot change the value of the variable whose address they are holding. Data Structures & Algorithms- Self Paced Course. These type of pointers can change the address they point to but cannot change the value kept at those address. What is an array of constant pointers in C? . ptr = NULL, ptr++, but modification of the content is not possible. In physics and mechanics, torque is the rotational equivalent of linear force. The easiest way to tackle the const/non-const pointer issue is to find out the different combinations. In other words, we can say that once a constant pointer points to a variable then it cannot point to any other variable. Finance is the study and discipline of money, currency and capital assets.It is related to, but not synonymous with economics, the study of production, distribution, and consumption of money, assets, goods and services (the discipline of financial economics bridges the two). Syntax const <type of pointer>* const <name of the pointer>; Declaration for a constant pointer to a constant is given below: Is a constant pointer. It is pretty difficult for me to understand or keep remember this. This indicates that the value can be changed. Lets take a small code to illustrate these type of pointers : As evident from the name, a pointer through which one cannot change the value of variable it points is known as a pointer to constant. Using flutter mobile packages in flutter web. 2) Pointer to Constant : These type of pointers are the one which cannot change the value they are pointing to. You are not allowed to modify the pointer, but you are allowed to modify what it points to e.g. See my answer here for much more differences between references and pointers. This is the difference in the syntax of a . A pointer to constant is defined as : Accepted answer. One such simple application of pointer to constant is to find the string length of the given string without any attempt to modify the original stringas shown inExample 1 and Example 2 gives an idea of usage of pointer to constant in strcmp() function. Solution 2. We can find n number of applications of these concepts in C as well as Embedded C Programming world. What does it mean to say that with a const pointer, it is the pointer itself that is constant, and that once the pointer is initialized with an address, it cannot point to anything else? You can change ptr to point other variable. Constant pointer can't be declared without initialisation. The const applies to the alias as a whole, meaning the thing that becomes const is pstring resulting in a constant pointer-to-char. Generally I would prefer the declaration like this which make it easy to read and understand (read from right to left): means that the pointed data is constant and immutable but the pointer is not. Constant pointer vs Pointer to constant. Very good clarification about "pointer to constant int". Pointers are always been a complex topic for the newbies into the C programming world. You cannot use this pointer to change the value being pointed to: char char_A = 'A'; const char * myPtr = &char_A; *myPtr = 'J'; // error - can't change value of *myPtr The second declaration, char * const myPtr Except when it is the operand of the sizeof or unary & operators, an expression of type "N-element array of T" will be converted to an expression of type "pointer to T", and the value of the expression will be the address of the first element of the array. Constant pointer : pointer is mutable but the data that pointer pointing is immutable (unchangeable); Pointer constant: Pointer is immutable but the data that pointer pointing is mutable. const * , const * , We declared two variables n1 and n2 and a pointer to constant ptr was declared and made to point n1. Output of the program | Dereference, Reference, Dereference, Reference. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. Introduction Emertxe is Indias leading EdTech company for fresh engineering graduates who want to work in the field of Embedded Systems and the Internet of Things (IoT). Connect with our professional trainers by filling the form with your details and get on board! Established in 2003, Emertxe continues to fulfill its commitment to bridge the gap between Emertxe is the prime provider of not only an education when it comes to embedded systems, but a whole ecosystem for any entity in the embedded domain to flourish. void DoSomething(const int& a) {} A pointer has its own address and it holds as its value the address of the value it points to. It is a pioneer in training freshers since 2003 by providing excellent placement opportunities for freshers. It represents the capability of a force to produce change in the rotational motion of the body. You could use const_cast (in C++) or c-style cast to cast away the constness in this case as data itself is not constant. These type of pointers can change the address they point to but cannot change the value kept at those address. Angelique Pointer Nov. 14 2022 Prof. Norwood Article Summary Asian Americans are always in constant battle with people in the United States who have biases. It is not allowed to edit "int" via pointer, however it is allowed to edit "int" via some other way. ramsay's kitchen boston yelp; restaurants on airport blvd, mobile, al; best sushi santa monica. @CtlinaSrbu Analogy is the last two lines of the answer. This is left as an exercise to analyze. You can modify pointer value, but you cannot modify the value pointed by pointer. In constant pointers, the pointer points to a fixed memory location, and the value at that location can be changed because it is a variable, but the pointer will always point to the same location because it is made constant here. You are not allowed to modify ptr but the object pointed to by ptr can be modified. Regarding the fact that I access this page very often, is there any analogy you do in your head in order to better retain the difference ? From the above summary, separate the part before asterisk(*) & part after the asterisk(*) as given in the below table-6. It can neither change the address of the variable to which it is pointing nor it can change the value placed at this address. This can be clearly understood by the pictorial representation given below. From the above fig, it is clear that at line no. In the above example, at line no.12 we are trying to change the value of the variable to which the pointer is pointing to, but this is not possible since the value is constant. In other words, we can say that once a constant pointer points to a variable then it cannot point to any other variable. 1) Constant Pointers : These type of pointers are the one which cannot change address they are pointing to. These type of pointers can. Suppose, your father own two lands and given you for farming. int x = 8; int *y = &x; int *y1 = &x; // e.g.1. Over the years 70000+ students have made their by emertxe_admin | May 21, 2019 | 0 Comments. A pointer to constant is defined as : const <type of pointer>* <name of pointer> 14, we tried to change the address of the pointer, We can find n number of applications of these concepts in, Example 1 and Example 2 gives an idea of usage of, Trick: How to understand the differences Pointer Constant Vs Constant Pointer in C programming. It's still technically cheating, but it works. An example of definition could be : 1 const int* pt //Constant pointer2 int* const pt; //pointer constant. A'constant pointer' is a pointer that cannot change the address it is containing. All Rights Reserved | Privacy Policy | Disclaimer, Pointer Constant & Constant Pointer Differences, Pointers are always been a complex topic for the newbies into the C programming world. We can also use it while mapping the I/O register with the help of pointers in C. Now, let us see some examples in which we will use the const qualifier in our program with a pointer: 1. but we can change the value at the pointer. The reason why Emertxe is the best choice for career advancement: eLearning and Online training programs are the way forward in the COVID-19 disrupted world. 1) Constant Pointers : These type of pointers are the one which cannot change address they are pointing to. This means they cannot change the value of the variable whose address they are holding. In Functions Pointers , function's name can be used to get function's address. In addition to fighting the devastating health impacts of the coronavirus pandemic . The opposite is possible. Note 2: But these pointers can change the valueof the variable theypoint tobut cannot change the address they are holding. xcode - Can you build dynamic libraries for iOS and bash - How to check if a process id (PID) database - Oracle: Changing VARCHAR2 column to CLOB. In other words, we can say that once a constant pointer points to a variable then it cannot point to any other variable. Before we talk about const reference vs. pointer in C++ class constructor, let's take a quick look at different ways of passing a parameter to a function. Contribute to portfoliocourses/c-example-code development by creating an account on GitHub. Syntax: const <type of pointer>* const <name of the pointer>; Example: const int* const ptr; Let us understand Constant Pointer to a Constant in C Language with an Example. In other words, we can say that once a constant pointer points to a variable then it cannot point to any other variable. How to use const and volatile together. 14, we tried to change the address of the pointer ptr to some other variable,but according to the concept it is not possible. A constant pointer can only point to single object throughout the program. A pointer to a constant is a pointer that cannot change the value of the address its holding through the pointer. If youre someone that believes in accomplishing your goals through perseverance? The difference is in what is constant. This means the address of a variable to which the pointer is pointing cannot be updated so far. After that is it possible to assign with, I feel there should be some other term for. int* const ptr), not a pointer to const (e.g. Pointer to constant. Riding along the digital revolution will ensure engineers are future-ready with skills to not only secure but by emertxe_admin | May 27, 2019 | 0 Comments. You will receive a link and will create a new password via email. You are not allowed to modify ptr but the object pointed to by ptr can be modified. Next, ptr is made to dereference, then print the value at ptr, but as per the pointer we cannot dereference, so we got the error mentioned below, error: assignment of read-only location *ptr. Please briefly explain why you feel this answer should be reported. Introduction: The world is well groomed for the next big bang - The Internet of Things. This means that suppose there is a pointer which points to a variable (or stores the address of that variable). 12, we are trying to change the value of the variable it is pointing to which is possible. You should mention that these are non-compiling examples, not examples of correct usage. Typical use scenarios for both involve either . const * int * const ptr; From the above summary, separate the part before asterisk(*) & part after the asterisk(*) as given in the below table-6. that once a constant pointer points to a variable then it cannot point to any other variable. #define a string literal then assign it to a char*, "assignment discards 'const' qualifier" error on non-const pointer. Output of the program | Dereference, Reference, Dereference, Reference. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); 2022 Stackoverflow Point. How does one declare an array of constant function pointers in C? Pointer to constant is a pointer that restricts modification of value pointed by the pointer. A constant pointer is declared as : int *const ptr( the location of 'const' make the pointer 'ptr' as constant pointer) 2) Pointer to Constant :These type of pointers are the one which cannot change the value they are pointing to. If the. It will be more confusion for the newbies when these, In this blog I want to focus on difference, As the name itself indicates that the value of the variable to which the pointer is pointing is constant in other words a pointer through which one cannot change the value of variable it points is known as a, Let us consider the code snippet to understand how, at line no.12 we are trying to change the value of the variable to which the pointer is, Now we will take the same example to show that the, From the above figure, one can understand that the, able-2: Briefing pointer to constant concept, is a pointer that cannot change the address it. A pointer to a constant is declared as : 'const int *ptr' (the location of 'const' makes the pointer 'ptr' as a pointer to constant. You can modify ptr itself but the object pointed to by ptr shall not be modified. score:0 . Declaration const int * ptr; constant pointer vs pointer to constant in c programming language | volatile with const, Constant pointers and Pointers to constant, What is difference between const char * and char * const in C, constant pointer & pointer to constant with simple example, const keyword | constant pointer | types of pointer | Programming in C, Difference Between const int *ptr , const int *const ptr , and many |Concept of Pointer in C/C++, Const pointers in c| Constant pointer in c| Constant pointer vs pointer to constant|Pointers|Part691, Read Chapter 3. const char * a; b can't change value, but can change pointer address const int *b = &a; // *b . You have two actors here: the pointer and the object pointed to. 2) Pointer to Constant : These type of pointers are the one which cannot change the value they are pointing to. acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Full Stack Development with React & Node JS (Live), Fundamentals of Java Collection Framework, Full Stack Development with React & Node JS(Live), GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Assigning multiple characters in an int in C language. Pointer to Constant As evident from the name, a pointer through which one cannot change the value of variable it points is known as a pointer to constant. Sign Up to our social questions and Answers Engine to ask questions, answer peoples questions, and connect with other people. I assume that you mean a const-valued pointer (e.g. TabBar and TabView without Scaffold and with fixed Widget. Please enter your email address. The declaration establishes that p points to a value that must remain constant. Gartner, worlds leading research and advisory company, states that 14.2 billion connected things will be in use in 2019, and that total will reach 25 billion by 2021. We use cookies to ensure that we give you the best experience on our website. C Programming Language Example Code. Click hereto get an answer to your question The pointer reading v/s load graph for a spring balance is as given in the figure. You can change the value at the location pointed by pointer p, but you can not change p to point to other location. Now if we try to point the pointer to some other variable (or try to make the pointer store address of some other variable), then constant pointers are incapable of this. Lost your password? Next, ptr is made to point n2, then print the value at ptr, but as per the constant pointer the pointer pointing an address cannot be change, so we will get the error mentioned below, error: assignment of read-only variable ptr. Constant pointer defines that the pointer is constant but not its value. A constant pointer ptr was declared and made to point var1. How they can interact together: neither the pointer nor the object is const; the object is const; the pointer is const; both the pointer and the object are const. It will be more confusion for the newbies when these sharp knivesare used along with some qualifiers like const in C programming. A constant pointer is a pointer that cannot change the address its holding. This ecosystem links fresh engineering students as well as professionals to the knowledge, practical Bengaluru-based embedded systems training institute Emertxe has launched a free online embedded internship programme for engineering graduates and students to help them tide over the pandemic-induced financial crisis. * const , We declared two variables n1 and n2 and constant pointer ptr was declared and made to point n1. An Uncommon representation of array elements, Delete a Linked List node at a given position, Find Length of a Linked List (Iterative and Recursive), Search an element in a Linked List (Iterative and Recursive), Write a function to get Nth node in a Linked List, C++ Programming Multiple Choice Questions. [Solved]-constant pointer vs pointer on a constant value-C score:190 Accepted answer char * const a; means that the pointer is constant and immutable but the pointed data is not. declares ptr a pointer to const int type. declares ptr a pointer to const int type. Finance activities take place in financial systems at various scopes, thus the field can be roughly divided into . An example declaration would look like : Lets take a small code to illustrate a pointer to a constant : is a pointer to constant (content). The value of p itself can be changed. 2021 CRANES VARSITY, ALL RIGHTS RESERVED, PG Diploma in Embedded and Automotive Systems, PG Diploma in Data Science and Machine Learning, PG Diploma in Full Stack Java development, PG Diploma in Embedded & Automotive System, Internship in Embedded & Automotive Systems, Internship in Data Science and Machine Learning, Internship in Full Stack Java Development, Linux System Programming and Device Drivers, INTEGRATED RTOS FOR FAST AND EFFICIENT IOT DEVELOPMENT, Five Technology Trends in Automotive Industry. means that the pointer is constant and immutable but the pointed data is not. A constant pointer is declared as follows : <type of pointer> * const <name of <type of pointer> * const <name of pointer> int * const ptr; You could use const_cast (in C++) or c-style cast to cast away the constness in this case as data itself is not constant. Now, when we compile the above code, compiler complains : Hence we see very clearly above that compiler complains that we cannot changes the address held by a constant pointer. Output of the Program | Pointer to a Constant or Constant Pointer? Phone Number Answer: Hello, Null pointer has a reserved value called as null pointer constant for indicating that it does not point to any valid object or function. Email Syntax. Lets first understand what a constant pointer is. Output of the Program | Use Macros Carefully! Unscrambling Declarations in C of the book Deep C Secrets by Peter linden, you will learn how to decipher any complex decalration with any combinations of pointers, constants etc, @user694733 on the other side it gives me a feeling as to how much developers want to contribute to the community that status of the question doesn't matter to them..at times :), in second case of of constant pointer can't we point to, Suppose constant pointer pointed to some memory and we are freeing that memory. C: Illegal conversion between pointer types: pointer to const unsigned char -> pointer to unsigned char. But we can change the value of pointer as it is not constant . Please briefly explain why you feel this question should be reported. just before and just after, when one of the string is cut. Consider two scenarios, You should not cultivate rice in land1 but you can do it in land2. Please briefly explain why you feel this user should be reported. The constant pointer will be one that will always point in the direction of the same address. Save my name, email, and website in this browser for the next time I comment. declares ptr a const pointer to int type. int *const ptr = &a; *ptr = 5; // right ptr++; // wrong. In C programming language, *p represents the value stored in a pointer and p represents the address of the value, is referred as a pointer. A constant pointer is declared as : int *const ptr ( the location of 'const' make the pointer 'ptr' as constant pointer). The programme will cover 1,000 engineering by emertxe_admin | Oct 4, 2020 | 0 Comments. That's how I retain it. Note: There is a minor difference between constant pointer and pointer to constant. Now we will take the same example to show that the address the pointer is containing is not a constant. Finally, we try to print the value ptr is pointing to. Please help. constant pointer vs pointer to constant in chyperbaric oxygen therapy non healing woundshyperbaric oxygen therapy non healing wounds How to check if widget is visible using FlutterDriver. hippopotamus high tea cost; bus reservation system project report pdf Not initializing a reference is a compile . Contribute to ohidulalam66/C-portfolio-Example development by creating an account on GitHub. declares ptr a const pointer to int type. Passing by value. const * const , We declared two variables n1 and n2 , here pointer to constant and constant pointer ptr was declared and made to point n1. A pointer to a const value (sometimes called a pointer to const for short) is a (non-const) pointer that points to a constant value. Login to our social questions & Answers Engine to ask questions answer peoples questions & connect with other people. A constant pointer is a pointer that cannot change the address its holding. int const * ptr > ptr is a pointer to a constant. void DoSomething(int a) {} // 2. Passing by const reference. How would you create a standalone widget from this widget tree? A pointer to a constant is declared as : const int *ptr (the location of const makes the pointer ptr as a pointer to constant. Then this is the place for you. e.g. Of course, it can also be said that the position of int* is different, but int* represents a pointer of type int. We are only incrementing value pointed by ptr.Try below program, you will get compiler error. means that the pointer is constant and immutable but the pointed data is not. You can modify ptr itself but the object pointed to by ptr shall not be modified. const char * a; means that the pointed data cannot be written to using the pointer a. Now, when we compile the above code, compiler complains : Hence we see very clearly above that compiler complains that we cannot changes the address held by a constant pointer. To declare a pointer to a const value, use the const keyword before the pointer's data type: int main() { const int x { 5 }; const int* ptr { & x }; * ptr = 6; return 0; } In the above example, ptr points to a . By registering, you agree to the Terms of Service and Privacy Policy .*. The sprin constant is 30--- Ext.com) - 1 2 3 Load (kg) (C) 4 0.3 kg/cm (A) 0.1 kg/cm (B) 5 kg/cm (D) 1 kg/cm . Why can I change the value of a const char* variable? Now, when the above code is compiled, the compiler complains : Hence here too we see that compiler does not allow the pointer to a constant to change the value of the variable being pointed. Mass of both the blocks is same and . Next, ptr is made to point n2, then print the value at ptr, and change the address and dereference the value, both are violating the rules, so we will get the error mentioned below, error: assignment of read-only location *ptr, error: assignment of read-only variable ptr, Name In this blog I want to focus on difference Pointer Constant Vs Constant Pointer in C programming. As a Stay on top of what's happening in Embedded and IoT industry, Copyrights 2020, Emertxe. A constant pointer to a constant is a pointer, which is a combination of the above two pointers. Though the essence of the volatile ("ever-changing") and const ("read-only") keywords may seem at first glance opposed, they are in fact orthogonal. It would have been nice had they flipped that declaration to make it more human-readable and intuitive. How to change background color of Stepper widget to transparent color? The output of the above code snippet is given below. But we can change the address of the pointer. high tea intercontinental sydney; kimpton blythswood square hotel; taylor sheridan shows; madewell small transport bag; horse performance show int const *xData; As you can see in the above declaration that "xData" is pointing to a constant integer . // 1. You are allowed to modify the pointer. Explanation: See following declarations to know the difference between constant pointer and a pointer to a constant. const int* and int const* says that the pointer can point to a constant int and value of int pointed by this pointer cannot be changed. Now, when the above code is compiled, the compiler complains : Hence here too we see that compiler does not allow the pointer to a constant to change the value of the variable being pointed. In the below example, We have declared two variables, i.e., a and b with the values 10 and 20 respectively. It is also referred to as the moment, moment of force, rotational force or turning effect, [citation needed] depending on the field of study. const int *xData; or. The difference between a constant pointer and a pointer to a constant in C. Source code: https://github.com/portfoliocourses/c-example-code/blob/main/const_. It would be great if you could tell us! Pointer to Constant As evident from the name, a pointer through which one cannot change the value of variable it points is known as a pointer to constant. int * const ptr > ptr is constant pointer. Pointer to constant vs. pointer constant. 2) Pointer to Constant : These type of pointers are the one which cannot change the value they are pointing to. What's the difference among (const char *str) , (char const *str) and (char *const str)? Let us consider the code snippet to understand how pointer to constant works. example. Note 2: But these pointers can change the valueof the variable they'point to'but cannot change the address they are 'holding'. Similarly, one can observe at line no. When should i use streams vs just accessing the cloud firestore once in flutter? Generally I would prefer the declaration like this . Placing const after the type name and before the * means that the pointer can't be used to change the pointed-to value. In other words, we can say that once a constant pointer points to a variable then it cannot point to any other variable. int const* ptr). This means they cannot change the value of the variable whose address they are holding. *ptr += 5. * const The pointer in programming refers to a variable that is pointing towards some specific address, probably of some variable address. Generally I would prefer the declaration like this which make it easy to read and understand (read from right to left): int const *ptr; // ptr is a pointer to constant int int *const ptr; // ptr is a constant pointer to int. But you cannot change the value pointed by ptr.Therefore above program works well because we have a constant pointer and we are not changing ptr to point to any other location. This means they cannot change the value of the variable whose address they are holding. const int* ptr; Both pointer to constant and constant pointer: Both pointer to constant and constant pointer is a pointer that cannot change the address its holding and cannot dereference the value also. - Pointer to constant points to a value that does not change and is declared as : const type * name type is data type name is name of the pointer Example : const char *p; - Pointer to constant can not be used to change the value being pointed to. a can't change value const int a = 5; //a = 6; // compile fail, main.cpp:18:6: error: assignment of read-only variable 'a' // e.g.2. Therefore : char ch = 'A'; const char *p = &ch; *p = 'B'; means that the pointer is constant and immutable but the pointed data is not. All Rights Reserved. [Solved]-Constant Pointer vs Constant Variable-C. Search. "Asian Americans: Battling Bias," produced by the CBS News Race and Culture unit, explores the discrimination facing the Asian American community in 2020. obs settings l5p transfer case fluid best reddit mysteries vmware vcenter license key doctor ferguson and partners constant of proportionality questions and answers unifi network group carla debug. The syntax for declaring a pointer to a constant in C is. const <data type> * <pointer name> = &<constant variable name>; OR <data type> const * <pointer name> = &<constant variable name>; Note: Although there are two syntaxes, as shown above, notice that the const keyword should appear before the *. c Constant pointer vs Pointer to constant. This can be clearly understood by the pictorial representation given below. Below is an example to understand the constant pointers with respect to references. The first declaration: const char * myPtr declares a pointer to a constant character. This means they cannot change the value of the variable whose address they are holding. This means that suppose there is a pointer which points to a variable (or stores the address of that variable). @JinKwon Of course you can do but it will have an entirely different meaning. Explanation:See following declarations to know the difference between constant pointer and a pointer to a constant. For example, it can be set to point at another const value. If you continue to use this site we will assume that you are happy with it. Looking at the const mentioned before, it is understood as a modifier. I would appreciate it if someone could explain these in a simpler way, and maybe give some example code while explaining what is happening along the way. 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