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Tuesday, 13 June 2017 11:37

C Pointer to Pointer

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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 in c

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 example

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.         
  11. printf("Address of number variable is %x \n",&number);    
  12. printf("Address of p variable is %x \n",p);    
  13. printf("Value of *p variable is %d \n",*p);    
  14. printf("Address of p2 variable is %x \n",p2);    
  15. printf("Value of **p2 variable is %d \n",**p);    
  16.     
  17. getch();        
  18. }        

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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