C++ : Do I need to cast to unsigned char before calling toupper(), tolower(), et al.?

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C++ : Do I need to cast to unsigned char before calling toupper(), tolower(), et al.?
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C++ : Do I need to cast to unsigned char before calling toupper(), tolower(), et al.?
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char unsigned calling Do I to tolower(), need : to et cast before toupper(), al.? C++



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