isspace()

test for a white-space character

Synopsis:

#include <ctype.h>
int isspace( int c );

Description:

The isspace() function tests for the following white-space characters:

' '

space

'\f'

form feed

'\n'

newline or linefeed

'\r'

carriage return

'\t'

horizontal tab

'\v'

vertical tab

Returns:

A nonzero character when the argument is one of the indicated white-space characters, otherwise zero.

Examples:

#include <stdio.h>
#include <ctype.h>

char chars[] = {'A', 0x09, ' ', 0x7d};

#define SIZE sizeof( chars ) / sizeof( char )

void main()
  {
    int   i;

    for( i = 0; i < SIZE; i++ ) {
      printf( "Char %c is %sa space character\n",
        chars[i],
        ( isspace( chars[i] ) ) ? "" : "not " );
    }
  }

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

Classification:

ANSI

See also:

isalnum(), isalpha(), iscntrl(), isdigit(), isgraph(), islower(), isprint(), ispunct(), isupper(), isxdigit()