cin_error_validation.cpp

#include <iostream>

using namespace std;


int main()
{
    int npm;
    char nama[50];
    bool bad = false;
    do
    {
        cout << "Input npm = ";
        cin >> npm;
        bad = cin.fail();
        if (bad)
            cout << "Error message" << endl;
        cin.clear();
        cin.ignore(10, '\n');
    }
    while(bad);
    cout << "Input nama = ";
    cin >> nama;
    cout <<endl;
    cout << npm <<endl;
    cout << nama;
}