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c++98 check if character is integer

Selfish Stag on Oct 04, 2020

std::string s = "1234798797";
std::istringstream iss(s);

int num = 0;

if (!(iss >> num).fail()) {
    std::cout << num << std::endl;
}
else {
    std::cerr << "There was a problem converting the string to an integer!" << std::endl;
}

Source: stackoverflow.com

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"c++98 check if character is integer" Code Answer's