Why the following c++ code keeps output “bad data, try again”?

Question

int main()
{
        int temp;
        while (cin>>temp, !cin.eof())
        {
                if (cin.bad())
                {
                        throw r         


        

Answer 1

Because your loop will end only when end-of-file is reached. But if you try to read a number where there is an alpha character, cin will fail but eof will never be reached. It will fail to read the number over and over again.