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Find the size of a union

/* Write a  C program to find the size of a union*/

#include <stdio.h>

void main()
{
union sample
{
int m;
float n;
char ch;
};

union sample u;

printf("The size of union =%d\n", sizeof(u));

/*initialization */

u.m = 25;
printf("%d %f %c\n", u.m, u.n,u.ch);

u.n = 0.2;
printf("%d %f %c\n", u.m, u.n,u.ch);

u.ch = 'p';
printf("%d %f %c\n", u.m, u.n,u.ch);
} /*End of main() */

/*-----------------------------------------
Output
The size of union =4
25 12163373596672.000000
-13107 0.200000 Í
-13200 0.199999 p
------------------------------------------*/