How to determine if a string is a number with C++?

Question

I\'ve had quite a bit of trouble trying to write a function that checks if a string is a number. For a game I am writing I just need to check if a line from the file I am r

Answer 1

Brendan this

bool isNumber(string line) 
{
    return (atoi(line.c_str())); 
}

is almost ok.

assuming any string starting with 0 is a number, Just add a check for this case

bool isNumber(const string &line) 
{
 if (line[0] == '0') return true;
 return (atoi(line.c_str()));
}

ofc "123hello" will return true like Tony D noted.