Full prototype:
int isxdigit(int);
Purpose and Notes:
Tests whether the character passed in as the argument to the function is a hexadecimal-digit character.
Returns:
int- C-style true if the character passed in as the argument to the function is a hexadecimal digit and a C-style false otherwise.
Argument 1:
int- A character to be tested to determine if it is a hexidecimal digit character or not.