C ctype isalpha() Function
Example
Check if a character is a letter:
char c = 'A';
if (isalpha(c)) {
printf("%c is a letter", c);
} else {
printf("%c is not a letter", c);
}
Definition and Usage
The isalpha() function returns a non-zero value (equivalent to boolean
true) if
a character is an alphabet letter (a-z).
Example of characters that are not alphabet letters: (space)!#%&? etc.
The isalpha() function is defined in the <ctype.h> header file.
Syntax
int isalpha(int c);Parameter Values
| Parameter | Description |
|---|---|
| c | Required. The ASCII value of a character or an actual character |
Technical Details
| Returns: | An int value which is non-zero (equivalent to boolean
true) if the character is a letter.Otherwise it returns 0 (equivalent to boolean false). |
|---|