IBM笔试题2

#include<iostream>using namespace std;void usigned_test();void main(){usigned_test();system("pause");}void usigned_test(){unsigned int a=-20;int b=6;printf("%d",a+b);puts("");printf("%u",a+b);(a+b>6)?puts(">6"):puts("<6");}

一般编译规则：表达式中signed 与 unsigned混合时，把signed提升为unsigned进行运算，结果为unsigned类型。