Good way to flush scanf buffer when invalid entry entered

Question

I have been thinking of ways to flush bad entries in scanf functions to allow for loop prompts to do their job.

I have a function call here that flushes th

Answer 1

There's a few ways of doing this. Effectively, what you're trying to do is consume a line of text up to a \n character (or an EOF.) To do this properly, you should use sscanf (or fscanf.)

sscanf("%*[^\n]\n");

This uses the regular expression [^\n]*\n (Any number of characters that are NOT \n, followed by a \n) and consumes everything matching that.

Edit: Because I'm dumb and forgot that scanf regex's use a slightly different syntax.