C ctype islower() Function
Example
Check if a character is a lowercase letter:
char c = 'b';
if (islower(c)) {
printf("%c is a lowercase letter", c);
} else {
printf("%c is not a lowercase letter", c);
}
Definition and Usage
The islower() function returns a non-zero value (equivalent to boolean true) if a character is a lowercase letter.
The islower() function is defined in the <ctype.h> header file.
Syntax
int islower(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 lowercase letter.Otherwise it returns 0 (equivalent to boolean false). |
|---|
