isspace() - ctype.h

The C library function int isspace(int c) checks whether the passed character is white-space.
Standard white-space characters are −
' '   (0x20)	space (SPC)
'	'	(0x09)	horizontal tab (TAB)
'
'	(0x0a)	newline (LF)
'v'	(0x0b)	vertical tab (VT)
'f'	(0x0c)	feed (FF)
'
'	(0x0d)	carriage return (CR)

Syntax

int isspace(int c);

Example

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

int main()
{
   int var1 = 't';
   int var2 = '1';
   int var3 = ' ';

   if( isspace(var1) )
   {
      printf("var1 = |%c| is a white-space character\n", var1 );
   }
   else
   {
      printf("var1 = |%c| is not a white-space character\n", var1 );
   }
   
   if( isspace(var2) )
   {
      printf("var2 = |%c| is a white-space character\n", var2 );
   }
   else
   {
      printf("var2 = |%c| is not a white-space character\n", var2 );
   }
   
   if( isspace(var3) )
   {
      printf("var3 = |%c| is a white-space character\n", var3 );
   }
   else
   {
      printf("var3 = |%c| is not a white-space character\n", var3 );
   }
   
   return(0);
}

Output / Return Value

var1 = |t| is not a white-space character
var2 = |1| is not a white-space character
var3 = | | is a white-space character

Limitations

Alternatives / See Also

Reference