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
------------------------------------------*/