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lang-cpp
std::isdigit(c)can be dangerous, because calling the functionstd::isdigitwith a negative argument value will invoke undefined behavior, unless that value is equal toEOF(which is usually-1). See this Stack Overflow answer to another question for further information. Writingstd::isdigit(static_cast<unsigned char>(c)), or using the C++ localization library version of the function, would be safer.static_cast.