Write a c program to find the size of union without using sizeof operator

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How to find size of union data type without using sizeof operator in c programming language  

#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);

  return 0;

}

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