C program to find the size of union without using sizeof operator.

source code:

#include<stdio.h>

union student

{

    int roll;

    char name[100];

    float marks;

};

int main()

{

  union student *ptr = 0;

  ptr++;

  printf("Size of the union student:  %d",ptr);

.  getch();

  return 0;

}