isalpha()
Test a character to see if it's alphabetic
Synopsis:
#include <ctype.h>
int isalpha( int c );
Arguments:
- c
- The character you want to test.
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
The isalpha() function tests if the argument c is an alphabetic character (a to z and A to Z). An alphabetic character is any character for which isupper() or islower() is true.
Returns:
Nonzero if c is an alphabetic character; otherwise, zero.
Examples:
#include <stdio.h> #include <stdlib.h> #include <ctype.h> int main( void ) { if( isalpha( getchar() ) ) { printf( "That's alphabetic\n" ); } return EXIT_SUCCESS; }
Classification:
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | Yes |
Signal handler | Yes |
Thread | Yes |