How to handle exception when scanf of integer gets a character

Question

The following simple program would give an endless loop when the input is a character, though it meant to tell a character from a digit. How to test if scanf gets a

Answer 1

You get an infinite loop because scanf doesn't consume the character, so the character will never leave the input buffer.

You can solve it by reading a line with e.g. fgets and then use sscanf on the line.