C语言位域 #

struct {
    类型 成员名 : 位数;
};

#include <stdio.h>

struct Flags {
    unsigned int a : 1;
    unsigned int b : 2;
    unsigned int c : 3;
};

int main() {
    struct Flags f = {1, 2, 5};
    
    printf("a = %u\n", f.a);
    printf("b = %u\n", f.b);
    printf("c = %u\n", f.c);
    printf("结构体大小: %zu\n", sizeof(f));
    return 0;
}

#include <stdio.h>

struct Date {
    unsigned int day : 5;
    unsigned int month : 4;
    unsigned int year : 12;
};

int main() {
    struct Date date = {31, 12, 2024};
    printf("日期: %u-%u-%u\n", date.year, date.month, date.day);
    return 0;
}