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How to define pointer to pointer in C language?
Declaring double pointer is similar to declaring pointer in C programming language. The difference is that only we need to add an additional ‘*’ before the name of pointer.
Syntax
The syntax is given below for declaring double pointers −
int **ptr;
Example
Following is the C program for pointer to pointer −
#include<stdio.h> // C program to demonstrate pointer to pointer int main(){ int element = 24; // pointer for element int *ptr2; // double pointer for ptr2 int **ptr1; // storing address of value in ptr2 ptr2 = &element; // Storing address of ptr2 in ptr1 ptr1 = &ptr2; // Displaying value of element using // both single and double pointers printf("element value = %d\n", element ); printf("element value using single pointer = %d\n", *ptr2 ); printf("element value using double pointer = %d\n", **ptr1); return 0; }
Output
When the above program is executed, it produces the following result −
element value =24 element value using single pointer = 24 element value using double pointer = 24
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