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Test a character to see if it's a whitespace character
#include <ctype.h>
int isspace( int c );
- c
- The character you want to test.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The isspace() function tests for the following whitespace
characters:
- ' '
- space
- '\f'
- form feed
- '\n'
- newline or linefeed
- '\r'
- carriage return
- '\t'
- horizontal tab
- '\v'
- vertical tab
Nonzero if c is a whitespace character; otherwise, zero.
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
char the_chars[] = { 'A', 0x09, ' ', 0x7d };
#define SIZE sizeof( the_chars ) / sizeof( char )
int main( void )
{
int i;
for( i = 0; i < SIZE; i++ ) {
if( isspace( the_chars[i] ) ) {
printf( "Char %c is a space character\n",
the_chars[i] );
} else {
printf( "Char %c is not a space character\n",
the_chars[i] );
}
}
return EXIT_SUCCESS;
}
This program produces the output:
Char A is not a space character
Char is a space character
Char is a space character
Char } is not a space character
ANSI,
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
Yes |
Signal handler |
Yes |
Thread |
Yes |
isalnum(),
isalpha(),
iscntrl(),
isdigit(),
isgraph(),
islower(),
isprint(),
ispunct(),
isupper(),
iswspace(),
isxdigit(),
tolower(),
toupper()
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