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

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

#include<stdio.h>

struct student{

    int roll;

    char name[100];

    float marks;

};

int main(){

  struct student *ptr = 0;

  ptr++;

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

  return 0;

}

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