What is the shortest way to check if a string contains the character “-” or it contains only numbers?
Edit: And how would I do it in C without std::string? Which one is better?
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What is the shortest way to check if a string contains the character “-” or it contains only numbers?
Edit: And how would I do it in C without std::string? Which one is better?
std::stringhas a member function,find, which can be used to search for a character or substring. It returnsstd::string::nposif the search character or substring is not found.One straightforward way to test whether a string contains only digits is to use the
find_first_not_ofmember function with the search list"0123456789". If it returnsstd::string::npos, the string contains only digits; if it returns any other value, there is some other, nondigit character in the string.