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高性能并行编程与优化 - 课件
https://space.bilibili.com/263032155
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print 处理 unsigned long long int 输出异常 #25

Closed jr981008 closed 11 months ago

jr981008 commented 11 months ago

unsigned long long int i1 = -1; print(i1); 预期： -1 实际： 18446744073709551615

archibate commented 11 months ago

你用std::cout << (unsigned long long)-1打印也是这个值，你用printf(“%llu”, -1)打印也是这个值。-1本来就不能放入无符号整数里，刚好回环成了ULONGLONG_MAX。

无法顺畅的大口呼吸，是活着的最好证明

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unsigned long long int i1 = -1; print(i1); 预期： -1 实际： 18446744073709551615

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