Web Reference: Dec 6, 2017 · isalnum () function in C programming language checks whether the given character is alphanumeric or not. isalnum () function defined in ctype.h header file. Alphanumeric: A character that is either a letter or a number. In C programming, library function isalnum () checks whether a character is alphabet or number, i.e., checks for an alphanumeric character (0-9, A-Z, a-z). Learn more about source code and example of isalnum (). This function accepts a single parameter − 1. c− This parameter represents the character to be checked. It is passed as an int, but it is expected to be a character that can be represented as an unsigned char or the value of EOF
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