Structure size without sizeof operator

Q : Write a ‘C’ program to find size of structure without using sizeof operator.

Solution :

#include<stdio.h>

typedef struct stu

{

     int roll;

     char name[20];

     char city[20];

}student;

void main()

{

     student *pt=0;

     pt++;

     printf("\n\tSize of structure is %d",pt);

}

Output : 

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