C++ - Check input type

bman

Hey,

I'm just wondering whats the best way to check the input from a user to ensure its an interger in C++?

int a;
cout << "Enter an integer value: ";
cin >> a;

//Check to make sure its an integer???

Is there some sort of type function to ensure the input is of type int?

markkilpatrick

you will need to have
#include <ios>
#include <limits>

and then do this


cin>>input;
while(!cin)
{
cout<<"invalid input. Please enter an interger."<<endl;
cin.clear();
cin.ignore(numeric_limits<streamsize>::max(), '\n');
cin>>input;
}

bman

Thanks. Will give that a go.

bman

This works if you input a string with a non numeric character as the first letter but not if the first character is a numeric character. For example, entering 35d still gets through. In this case it seems to take 35 as the integer value.

Any ideas on this problem?