#include <ctype.h>
Include dependency graph for isalnum.c:
Functions | |
| int | isalnum (int c) |
| Checks if the given character is an alphanumeric character. More... | |
Function Documentation
◆ isalnum()
| int isalnum | ( | int | ch | ) |
Checks if the given character is an alphanumeric character.
Checks if the given character is an alphanumeric character using the default locale. The following characters are alphanumeric:
- digits (0123456789)
- uppercase letters (ABCDEFGHIJKLMNOPQRSTUVWXYZ)
- lowercase letters (abcdefghijklmnopqrstuvwxyz)
The behavior is undefined if the value of ch is not representable as unsigned char and is not equal to EOF.
- Parameters
-
ch The character to classify
- Returns
- Non-zero value if the character is an alphanumeric character, 0 otherwise.
References isalpha(), and isdigit().
Referenced by bad_input(), good_input(), and ispunct().
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