请问运行后输出的结果为何是 1 -1 -1？

Question

#include <stdio.h>typedef struct{int a:2;int b:2;int c:1;}test ;void main(){test t;t.a = 1;t.b = 3;t.c = 1;printf("%d\n",t.a);printf("%d\n",t.b);printf("%d\n",t.c);}

Answer 1

typedef struct
{
unsigned int a:2;
unsigned int b:2;
unsigned int c:1;
}test ; //改成无符号数试试