下面是一个结构体位域，结构体变量的内存大小不应该是8Byte吗，为什么是4Byte?

Question

#include <stdio.h>
struct EIGHT_BYTE
{
    unsigned char ccc1 : 1;
    unsigned int ccc2 : 1;
} eight_byte;

int main(int argc, char const *argv[])
{
    printf("sizeof one_byte is : %lu\n", sizeof(one_byte));
    printf("sizeof two_byte is : %lu\n", sizeof(two_byte));
    printf("sizeof three_byte is : %lu\n", sizeof(three_byte));
    printf("sizeof four_byte is : %lu\n", sizeof(four_byte));
    printf("sizeof eight_byte is : %lu\n", sizeof(eight_byte));
    return 0;

sizeof eight_byte is : 4

Answer 1

我在vs2019上测试 大小是8啊