birthDateInTwoBytes

#include <stdio.h>
#define BASE_YEAR 1900
struct date {
    unsigned short day : 5;
    unsigned short month : 4;
    unsigned short year : 7;
};
int main() {
    struct date birthday;
    birthday.day = 14;
    birthday.month = 3;
    birthday.year = 2003 - BASE_YEAR;
    printf("\n My birthday is %u.%u.%u \n", birthday.day, birthday.month, birthday.year + BASE_YEAR);
    printf("\n Size of birthday structure is %lu bytes", sizeof(birthday));
    return 0;
}