Thread: Unable to enter additional input after validation

Originally Posted by RenFromPenn

I just tried it and the text just keeps printing and printing.

you should break out of the loop after the user has done what you asked for

Originally Posted by RenFromPenn

Okay, I got it to work. I broke the while loop by adding flushall();

Thank you all for your help!

That is the wrong solution - flushall is a function that isn't guaranteed to do anything useful or meaningfull for input channels. _DO_ look up the FAQ link that was posted a few posts back. It contains a loop that does getchar(), which is safe and correct.

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Mats

Code:

  int   ch;

  while ((ch = getchar()) != '\n' && ch != EOF);

put int ch in with your variables, and the line starting with "while" where you want to clean up your input buffer. Calling this after any scanf should be fine (assuming you don't expect someone to enter a bunch of stuff on one line, but you read it using several scanf stataments, e.g a loop to read 10 integers, and someone expects to be able to enter the 10 numbers in a line).

You could also put all of the above code into a function, and then call that function when you feel a need to clean up the input.

The above function is ALSO very useful if you are mixing scanf() and fgets() or scanf with "%s" or "%c", since scanf leaves newlines in the input buffer, and when you then call fgets, it sees the newline from your the input to scanf, and takes the input to be blank.

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Mats