/* This program illustrates the size of union data type. The union
   type will allocate enough memory space of the field with the
   largest memory space. In this case it is num.double_num of 8 bytes.
*/
#include <stdio.h>

int main(void) {

  union number_union {
    char     character_num;
    int      integer_num;
    float    float_num;
    double   double_num;
  } num;
  
  printf("size of num: %d\n", sizeof(num));
  printf("size of num.character_num: %d\n", sizeof(num.character_num));
  printf("size of num.integer_num: %d\n", sizeof(num.integer_num));
  printf("size of num.float_num: %d\n", sizeof(num.float_num));
  printf("size of num.double_num: %d\n", sizeof(num.double_num));
  
  system("pause");
  return 0; 
}