结构与联合

#include <stdio.h>
union{
　　int i;
　　char x[2];
}a;
int main(){
    a.x[0] = 10;
    a.x[1] = 1;
    printf("%d", a.i);
}

int main(){
    union{
        int i;
        struct{
            char first;
            char second;
        }half;
    }number;
    number.i = 0x4241;
    printf("%c%c\n", number.half.first, number.half.second);
    number.half.first = ‘a‘;
    number.half.second = ‘b‘;
    printf("%x\n", number.i);
    return 0;
}