input validation for numeric input

Question

I\'m very new to this C++ world and trying write a input validation function for numeric password. This is what I got so far:

#include 
#incl         


        

Answer 1

This looks like line oriented input. In which case, the usual solution is to use getline:

bool parseNumber( std::string const& text, int& results )
{
    std::istringstream parser( text );
    return parser >> results >> std::ws && parser.peek() == EOF;
}

int getNumber()
{
    int results;
    std::string line;
    while ( ! std::getline( std::cin, line ) || ! parseNumber( line, results ) ) 
    {
        std::cin.clear();
        std::cout << "Only 'numeric' value(s) allowed:";
    }
    return results;
}