#include <ctype.h>
int isalnum(int c);
Implemented
IEEE Std 1003.1-2017
The isalnum() function shall test whether c is a character of class alpha or digit in the current locale.
The c argument is an int, the value of which the application shall ensure is representable as an unsigned char or
equal to the value of the macro EOF. If the argument has any other value, the behavior is undefined.
The isalnum() function shall return non-zero if c is an alphanumeric character, otherwise shall return 0.
No errors are defined.
Tested
None