Loop until integer input is in required range fails to work with non-digit character inputs

Question

I\'m having a problem with what should be incredibly simple code. I want to take in an integer between 1 and 3 with error checking. It works fine for checking for numbers

Answer 1

Most of these answers include unnecessary complexity.

Input validation is a perfect time to use a do-while

do{

   cout << "\nPlease enter a number from 1 to 3:" << endl;
   cout << "-> ";

   if(!cin){
      cout << "Invalid input"
      cin.clear()
      cin.ignore(numeric_limits::max(), '\n');
   }

}while(!(cin >> input))

• Use numeric_limits::max() to completely clear the buffer after a failed cin.

• Use cin.clear() to reset the fail flag on cin so !cin wont always evaluate false.

cin.fail() is fine. However some would consider !cin more natural.

from my previous post https://stackoverflow.com/a/43421325/5890809