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Pointer to Pointer in c

In C pointer to pointer concept, a pointer refers to the address of another pointer.

In c language, a pointer can point to the address of another pointer which points to the address of a value. Let’s understand it by the diagram given below:

 

pointer to pointer makeforsure

Let’s see the syntax of pointer to pointer.

  1. int **p2;

C pointer to pointer example

Let’s see an example where one pointer points to the address of another pointer.

 

c pointer to pointer mfs

As you can see in the above figure, p2 contains the address of p (fff2) and p contains the address of number variable (fff4).

  1. #include <stdio.h>      
  2. #include <conio.h>    
  3. void main(){
  4. int number=50;
  5. int *p;//pointer to int
  6. int **p2;//pointer to pointer    
  7. clrscr();
  8. p=&number;//stores the address of number variable  
  9. p2=&p;
  10. printf(“Address of number variable is %x \n”,&number);
  11. printf(“Address of p variable is %x \n”,p);
  12. printf(“Value of *p variable is %d \n”,*p);
  13. printf(“Address of p2 variable is %x \n”,p2);
  14. printf(“Value of **p2 variable is %d \n”,**p);
  15. getch();
  16. }

Output

Address of number variable is fff4
Address of p variable is fff4
Value of *p variable is 50
Address of p2 variable is fff2
Value of **p variable is 50
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