size of data types

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

#include<stdio.h>

int main(){

  int *ptr = 0;

  ptr++;
  printf("Size of int data type:  %d",ptr);

  return 0;

}

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

#include<stdio.h>

int main(){

  double *ptr = 0;

  ptr++;
  printf("Size of double data type:  %d",ptr);

  return 0;
}

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

#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;
}

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

#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;