Question

Question’s all in the title.
I’m making a calculator and I obviously need input. I use the cin>> function but I was wondering if there is a way to test the input to find out if it’s a number.
If I enter anything that isn’t a number the program crashes. Is there a built in function/operator? Please help!

Answer 1

The input operator will only read to an integer if the input is a number. Otherwise it will leave the characters in the input buffer.

Try something like this

int i;
if (cin >> i)
{
    // input was a number
}
else
{
    // input failed
}