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Pointer to pointer in C Language
A pointer variable in C language can also contain address of another pointer variable. This concepts is called pointer to pointer. We can declare a pointer to pointer as:
int **ptr;
Here, ptr is a pointer to pointer.
Program of pointer to pointer in C
|
#include<stdio.h> int main() { int var1=20,*var2,**ptr; var2=&var1; ptr=&var2; printf("\n*ptr=%u",*ptr); printf("\n**ptr=%d ",**ptr); return(0); } |
| Output |
*ptr=65524 **ptr=10 |
| Description |
| In the above program, ptr is pointer to pointer. It contains address of aother pointer variable var2 which contains the address of variable var1. *var2 refers to the value of var1. *ptr refers to the address of var1. **ptr refers to the value of variable var1. |
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