islower()
Test a character to see if it's a lowercase letter
Synopsis:
#include <ctype.h> int islower( int c );
Arguments:
- c
- The character you want to test. This must be representable as an unsigned char or be EOF; the behavior for other values is undefined.
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
The islower() function tests for any lowercase letter a through z.
Returns:
Nonzero if c is a lowercase letter; otherwise, zero.
Examples:
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
char the_chars[] = { 'A', 'a', 'z', 'Z' };
#define SIZE sizeof( the_chars ) / sizeof( char )
int main( void )
{
int i;
for( i = 0; i < SIZE; i++ ) {
if( islower( the_chars[i] ) ) {
printf( "Char %c is a lowercase character\n",
the_chars[i] );
} else {
printf( "Char %c is not a lowercase character\n",
the_chars[i] );
}
}
return EXIT_SUCCESS;
}
produces the output:
Char A is not a lowercase character Char a is a lowercase character Char z is a lowercase character Char Z is not a lowercase character
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Interrupt handler | Yes |
| Signal handler | Yes |
| Thread | Yes |
Last modified: 2013-12-23