Write a program in C to demonstrate the use of & (address of) and *(value at address) operator.

#include <stdio.h>

void main()

{

  int num=785;

  float real = 387.91;

  char letter = ‘A’;

  int *ptr1;

  float *ptr2;

  char *ptr3;

  ptr1= &num;

  ptr2=&real;

  ptr3=&letter;

  printf ( ” num = %d\n”,num);

  printf ( ” real = %f\n”,real);

  printf ( ” letter = %c\n”,letter);

  printf(“\n Using \’&\’ Address of value :\n”);

  printf ( ” Address of num = %p\n”,&num);

  printf ( ” Address of real = %p\n”,&real);

  printf ( ” Address of letter = %p\n”,&letter);

  printf(“\n Using \’&\’ and \’*\’ Value at address :\n”);

  printf ( ” Value at address of num = %d\n”,*(&num));

  printf ( ” Value at address of real = %f\n”,*(&real));

  printf ( ” Value at address of letter = %c\n”,*(&letter));

  printf(“\n Using only pointer variable :\n”);

  printf ( ” Address of num = %p\n”,ptr1);

  printf ( ” Address of real = %p\n”,ptr2);

  printf ( ” Address of letter = %p\n”,ptr3);

  printf(“\n Using only pointer operator :\n”);

  printf ( ” Value at address of num = %d\n”,*ptr1);

  printf ( ” Value at address of real= %f\n”,*ptr2);

  printf ( ” Value at address of letter= %c\n\n”,*ptr3);

}

Output:

num = 785

real =387.91

letter = A

Using ‘&’ Address of value:

Address of num = 0x7ffe2135ca30

Address of real = 0x7ffe2135ca34

Address of letter = 0x7ffe2135ca2f

Using ‘&’ and ‘*’ Value at address:

Value at address of num = 785

 Value at address of real = 387.91

Value at address of letter = A

Using only pointer variable:

Address of num = 0x7ffe2135ca30

Address of real = 0x7ffe2135ca34

Address of letter = 0x7ffe2135ca2f

Using only pointer operator:

Value at address of num = 785

Value at address of real= 387.91

Value at address of letter= A