Q:

C program to demonstrate example of double pointer (pointer to pointer)

belongs to collection: C pointers example programs

mahmoud2506
Save to bookmark
|
2022-05-04
|
  598 
0

C program to demonstrate example of double pointer (pointer to pointer)

In this program, we have to declare, assign and access a double pointer (pointer to pointer) in C.

As we know that, pointers are the special type of variables that are used to store the address of another variable.

But, when we need to store the address of a pointer variable, we cannot assign it in a pointer variable. To store address of a pointer variable, we use a double pointer which is also known as pointer to pointer.

C programming, examples, C programming examples,
login and add your own answer to this question

All Answers

mahmoud2506
2022-05-04
need an explanation for this answer? contact us directly to get an explanation for this answer

C program for double pointer (pointer to pointer)

/*C program to demonstrate example of double pointer (pointer to pointer).*/
#include <stdio.h>
 
int main()
{
    int a;          //integer variable
    int *p1;            //pointer to an integer
    int **p2;           //pointer to an integer pointer
     
    p1=&a;          //assign address of a
    p2=&p1;         //assign address of p1
     
    a=100;          //assign 100 to a
     
    //access the value of a using p1 and p2
    printf("\nValue of a (using p1): %d",*p1);
    printf("\nValue of a (using p2): %d",**p2);
     
    //change the value of a using p1
    *p1=200;
    printf("\nValue of a: %d",*p1);
    //change the value of a using p2
    **p2=200;
    printf("\nValue of a: %d",**p2);
     
    return 0;
}

Output

    Value of a (using p1): 100
    Value of a (using p2): 100
    Value of a: 200
    Value of a: 200

need an explanation for this answer? contact us directly to get an explanation for this answer

total answers (1)

C pointers example programs
This question belongs to these collections

Similar questions

need a help?

find thousands of online teachers now
C program to print size of different types of poin... >>