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並前往https://www.quora.com/In-C-why-do-we-need-unsigned-char-I-mean-shouldnt-char-by-default-only-hold-positive-numbers

In C++, why do we need unsigned char? I mean, shouldn't ...

Same as for int (it is signed), and one must declare type: unsigned int. If your use a char to index an array, and it is a value with the most significant bit ...

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