How do I check if input is an integer/string?

Question

My problem here is I don\'t know how to insert a rule wherein if a user inputted a number on the string, it will cout a warning saying it\'s not valid, same wit

Answer 1

you could use cin.fail() method! When cin fails it will be true and you could us a while loop to loop until the cin is true:

cin>>d;
while(cin.fail()) {
    cout << "Error: Enter an integer number!"<> d;
}