Pointer Type Declaration

Consider the following program –

#include<stdio.h>

void main()

{

int n; // normal integer variable storing value

int *ptr; // since '*' is used, hence it is a pointer variable storing addres of value

n = 10;

/*     '&' returns the address of the variable 'i'

        which is stored in the pointer variable 'a'

 */

ptr = &n;

printf("\nAddress of n is    : %u",&n); //output let 65524

printf("\nAddress of ptr is : %u",&ptr); //output let 65522

printf("\nValue of  n is    : %d", n); // output is 10

printf("\nValue of ptr is : %u",ptr); // output is 65524

printf("\nValue pointed thr ptr is : %d", *ptr); // output is 10

 

}

            After declaration memory map will be like this –

int i = 10;

int *ptr;

            

After Assigning the address of variable to pointer , i.e after the execution of this statement –

ptr = &i;