Validating Input...

In C++ if an integer value is expected,and the user enters a character,what value shall the variable actually take?


int n;
cout<<"n=";
cin>>n;



And also,what sort of validation is it best to use?
For example,this won't work:


int n;
do
cout<<"Enter a number:";
while(!(cin>>n));



:confused:

Well, I hardly ever use console stuff but I believe that you can just do it like how you have done except instead of !cin>>n using cin.fail (it's a bool)..


int n;
do
cout<<"Enter a number:";
cin>>n;
while(cin.fail);


As for the value the variable will take when a char is entered, I don't think it will take any value. It isn't initialized in your example so it probably has some random number in it.

Hmm..well it's quite odd that !cin>>n doesn't work,it should be working coz cin returns a bool value depending on it's succes in reading the value...