Input Validation

[Flynn380]

Can anyone help me with a bit of code that will validate the input from a user? I know that cin.fail() works for most cases, i.e.

float i;
cout << "please enter a number\n";
cin >> i;
    if(cin.fail())
      {
       cout << "you did not enter a number\n";
      }
    else
      {
       cout << "your number is: "<< i << endl;
      }

So with the above if someone enters 'bob' when asked for the number the program will tell the user that they did not enter a number. However is the user enters '5bob' the error will not be caught. I know the code above is rather sloppy, but I just wanted to give a quick example. If anyone can help I would appreciate it. Thanks!

[firedraco]

Get the entire input into a string, then use a stringstream to get it out (essentially what you are doing there). But since you have a stringstream, you can check to see if there is still data left to be read. If there is, there is a problem.