In the example above, we used the pointer variable to get the memory address of a variable (used together with the & reference operator). You can also get the value of the variable the pointer points to, by using the * operator (the dereference operator):

Here, 5 is assigned to the c variable. And, the address of c is assigned to the pc pointer. To get the value of the thing pointed by the pointers, we use the * operator. For example: int* pc, c; c = 5; pc = &c; printf("%d", *pc); // Output: 5

Pointer : Show the basic declaration of pointer : ------------------------------------------------------- Here is m=10, n and o are two integer variable and *z is an integer z stores the address of m = 0x7ffd40630d44 *z stores the value of m ...

Well, in C, the name of an array, is actually a pointer to the first element of the array. Confused? Let's try to understand this better, and use our "memory address example" above again.

The value of the variable which ... to access and manipulate the variable's value. In the below example, we are taking an integer variable with its initial value and changing it with the new value....

#include<stdio.h> int main () { ... printf("Address stored in pntr variable: %x\n", pntr ); //access the value using the pointer printf("Value of *pntr variable: %d\n", *pntr ); return 0; } ... Address of n variable: 2cb60f04 Address stored in pntr variable: 2cb60f04 Value ...

This is a simple example of how function pointer arrays make programs more flexible and reusable. A function pointer stores the address of a function. You can declare, assign, and call functions through it. It allows passing functions as arguments to other functions. Useful for callbacks, menus, and flexible program design. ... If you want to use W3Schools services as an educational institution...

We use the ampersand (&) symbol to get the address of a variable. ... In this example, we're saying, "Create an integer variable 'number' with the value 42, and then create a pointer 'ptr' that points to the address of 'number'."

4 days ago - Another common use of pointers is to point to dynamically allocated memory from malloc which returns a consecutive block of memory of no less than the requested size that can be used as an array. While most operators on arrays and pointers are equivalent, the result of the sizeof operator differs. In this example, sizeof(a) will evaluate to 5 * sizeof(int) (the size of the array), while sizeof(ptr) will evaluate to sizeof(int *), the size of the pointer itself.

In this example, we have a function modify_value that takes a pointer to an integer and doubles its value. We create a function pointer modifier that can point to such functions, and use it to modify our number variable.

C Examples C Real-Life Examples C Exercises C Quiz C Compiler C Syllabus C Study Plan C Interview Q&A C Certificate ... You can use pointers with structs to make your code more efficient, especially when passing structs to functions or changing their values.

Here, we're creating a character 'A' and then telling our pointer to remember where 'A' lives in memory. Let's put what we've learned into practice with a simple example:

In this example, we've created a Book structure and used a pointer to dynamically allocate memory for it. We then use the arrow operator to set its values and pass the pointer to a function for printing.

In this example, malloc() returns a void pointer, which we cast to an int*.

C Examples C Real-Life Examples C Exercises C Quiz C Compiler C Syllabus C Study Plan C Interview Q&A C Certificate ... You can also have a pointer that points to another pointer.

June 23, 2025 - A pointer in C is a variable pointing to the address of another variable. Explore C Pointer's ✓ types ✓ advantages ✓ disadvantages, and more. Start learning!

Dereferencing is the act of referring to where the pointer points, instead of the memory address. We are already using dereferencing in arrays - but we just didn't know it yet. The brackets operator - [0] for example, accesses the first item of the array. And since arrays are actually pointers, accessing the first item in the array is the same as dereferencing a pointer.

May 3, 2023 - This declares three pointer variables named "p", "q", and "r" that can hold the memory address of an integer. When we declare a pointer variable, it does not automatically point to any particular memory location. To initialize a pointer to point to a specific variable or memory location, we use the ampersand & operator to get the address of that variable. For example, to initialize the pointer p to point to an integer variable called x, we would write:

C Examples C Real-Life Examples C Exercises C Quiz C Compiler C Syllabus C Study Plan C Interview Q&A C Certificate ... Pointer arithmetic means changing the value of a pointer to make it point to a different element in memory.