Web Reference: Jul 23, 2025 · How isdigit () Function Works? The working of the isdigit () function is based on the ASCII values of the characters that are used to represent them in the memory. It compares the ASCII value of the given character to the range of ASCII value of the characters that represent numeric digit [48, 57]. In C programming, library function isdigit ( ) checks whether a character is numeric character (0-9) or not. If a character passed to isdigit ( ) is a digit, it returns non-zero integer and if not it returns 0. This function accepts a single parameter − 1. c− This is the character to be checked, passed as an integer.This is an ASCII value of a character.
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