Indicates if a character is classed either as alphabetic or as a
digit in the program's current locale.
Format
#include <ctype.h>
int isalnum (int character);
Argument
- character
- An object of type int. The value of character must be
representable as an unsigned char or must equal the value of the
macro EOF. If it has any other value, the behavior is undefined.
Return Values
| nonzero | If alphanumeric. |
| 0 | If not alphanumeric. |
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