问题描述
大家好，
我什么时候应该担心签名与未签名的比较
整数？有人能给我一个例子，这样的比较会导致
不想要的结果吗？
谢谢，
Tim。
Hi all,
When should I be worried about doing a comparison of signed vs unsigned
ints? Could someone give me a example where such a comparison would lead to
unwanted results?
Thanks,
Tim.
推荐答案
#include< iostream>
int main（）
{
int a = -100;
unsigned int b = 100;
std :: cout<< a<< "是
<< （a< b？""" not not）<< "少于 << b<< ''\\ n'';
}
#include <iostream>
int main()
{
int a = -100;
unsigned int b = 100;
std::cout << a << " is "
<< (a < b ? "" : "not") << " less than " << b << ''\n'';
}
#include< iostream>
int main（）
{
int a = -100;
unsigned int b = 100;
std :: cout<< a<< "是
<< （a< b？""" not not）<< "少于 << b<< ''\\ n';;
}
#include <iostream>
int main()
{
int a = -100;
unsigned int b = 100;
std::cout << a << " is "
<< (a < b ? "" : "not") << " less than " << b << ''\n'';
}
另一个例子：
#include< iostream>
int main（）
{
int a = -1;
unsigned int b = std :: numeric_limits< unsigned int> :: max（）;
std :: cout<< a<< "是 << （a == b？""：" not"）
<< "等于 << b<< ''\\ n'';
}
Another example:
#include <iostream>
int main()
{
int a = -1;
unsigned int b = std::numeric_limits<unsigned int>::max();
std::cout << a << " is " << (a == b ? "" : "not")
<< " equal to " << b << ''\n'';
}
谢谢Rolf！
Thanks Rolf!
这篇关于比较签名与未签名的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！