C++ - Check if a value is a number

April 2018



Issue


I need a routine to check if a particular is a number in order to prevent a C++ program to crash. Can you please give me an example of how it should be like?

Solution


What you can do is test the value returned by cin.


int nbJoueur=0;
cout << "nombre:";
while( !(cin >> nbJoueur) ) {
string tmp;
cin.clear();
cin >> tmp;
cout << "incorrect" << endl;
}

Thanks to fiddy for this tip.
Published by aakai1056. Latest update on January 5, 2012 at 07:20 AM by aakai1056.
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