How to check if cin is int in c++? [duplicate]

Answer 1

cin will toggle it's failbit if the user does not enter a correct data type that it was expecting. Changing the datatype of the inputs to int and checking this failbit will allow you to validate user input.

#include <limits>

cout << "enter two integers: " << endl;
int input1, input2;
cin >> input1;
cin >> input2;

while (!cin.good())
{
    cin.clear();
    cin.ignore(numeric_limits<streamsize>::max(), '\n')
    ...//ask again
}

Answer 2

You shouldn't use string at all.

int input1, input2;
cin >> input1;

Then you can check if cin failed

if (!cin) {
     // input was not an integer ask again
}