Bit field Sample C Code

/*Space optimized Structure representation of date */
#include <stdio.h>
struct date
{
         /* d has value between 1 and 31, so 5 bits are sufficient */
          unsigned int d: 5;
         /* m has value between 1 and 12, so 4 bits are sufficient */
         unsigned int m: 4;
         unsigned int y;
};
 
int main()
{
         printf("Size of date is %d bytes\n", sizeof(struct date));
         struct date dt = {31, 12, 2014};
         printf("Date is %d/%d/%d", dt.d, dt.m, dt.y);
         return 0;
}