Сергей Соколов

➜  /tmp  cat test.cpp
#include <iostream>

int main(int argc, char *argv[])
{
    int i;
    std::cin >> i;
    if (!std::cin) {
        std::cout << "bad integer" << std::endl;
    }
    return 0;
}
➜  /tmp  g++ test.cpp
➜  /tmp  ./a.out
1234
➜  /tmp  ./a.out
adsf
bad integer