1. The problem statement, all variables and given/known data Give an example of a key that does not return an ASCII code. 3. The attempt at a solution I looked at the extended ASCII table on www.ascii-code.com and found that there are several "control characters" which do not return a printable character. It seems pretty obvious that the escape key does not print a character, for example. However, it still returns code 1B (hex). I cannot imagine why there would be a key that would not return an ASCII code, and if so which key(s) that/they would be.