[code#include<stdio.h>
union book{
               int leng;
               double kk;
               char a_name; };
int main()
{
    union book x;

    x.a_name='h';
    x.kk=12.2;
    x.leng=1;
    printf("%c,%f,%d",x.a_name,x.kk,x.leng);
    return 0;
}
][/code]这个a_name为什么显示不出来

居然要按顺寻来赋值

你的x.leng输出错误了

二楼的还是错的