isalpha()

Test for a letter

Synopsis:

#include <ctype.h>

int isalpha( int c );

Library:

libc

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:

ANSI

See also:

isalnum(), iscntrl(), isdigit(), isgraph(), islower(), isprint(), ispunct(), isspace(), isupper(), isxdigit(), tolower(), toupper()