Name

The iswblank() function tests whether ’wch’ is a wide-character that belongs to the character class - blank (see defns for definition). The character class blank contains the character space(’ ’) and the horizontal tabulation(’     ’).

The result of this function is undefined unless the argument is WEOF or a valid wchar_t value.

The functionality of this API is independent of the program’s current locale and so it returns non-zero for all the characters (of various locales supported) that belong to the class blank, irrespective of the locale they belong to.

#include<wctype.h> //iswblank()
#include<stdio.h> //printf()
int test_iswblank()
{
   int arr[]={0x0020,’0’,0x0009,’R’,0x3000, 0x000A, 0x002};
   int i = 0;
   int size = 7;
   for( i=0; i<size; i++)
   {
     int ret = iswblank(arr[i]); //call to the API with the chars in arr[]
     if( (!ret) != 0 )
     {
        printf("\n%lc is not wide blank ", arr[i]);
     }
     else
     {
        printf("\n%lc is wide blank", arr[i]);
     }
   }
printf("\n");
}

Output

is wide blank
0 is not wide blank
     is wide blank
R is not wide blank
กก is wide blank
 is not wide blank
 is not wide blank

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