无符号整形(unsigned) 和 有符号整形(int) 的比较会默认强制转换为 无符号类型(unsigned)
- 先来看示例代码,这里以 int a = -1 和 unsigned int b = 77 来做大小比较:
#include <iostream>
using namespace std;
int main()
{
int a = -1;
unsigned int b = 77;
if (a > b) //a > b = true
cout << "a > b" << endl;
else
cout << "a < b" << endl;
cout << " a = " << a << endl;
cout << " b = " << b << endl;
}
- 运行结果
- 如下图,a = -1,b = 77,但比较结果却是a > b, 即-1 > 77
- 原因正是两者类型不同导致的,这如果在实际项目中遇到了,在debug的时候真的感觉是见鬼了。

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