小编Gre*_*ttR的帖子

等于equal是false的C ++规则是什么？鉴于：

float f {-1.0};
bool equal = (static_cast<unsigned>(f) == static_cast<unsigned>(-1.0));

例如https://godbolt.org/z/fcmx2P

#include <iostream>

int main() 
{
          float   f {-1.0};
    const float  cf {-1.0};

    std::cout << std::hex;
    std::cout << " f" << "=" << static_cast<unsigned>(f) << '\n';
    std::cout << "cf" << "=" << static_cast<unsigned>(cf) << '\n';

    return 0;
}

产生以下输出：

 f=ffffffff
cf=0