iswblank() function in C/C++


The iswblank() is a built-in function in C/C++ which checks if the given wide character is a blank character or not. It is defined within the cwctype header file of C++.

Syntax:

int isblank(ch)

Parameter: The function accepts a single mandatory parameter ch which specifies the wide character which we have to check that if it is a blank character or not.



Return Value: The function returns two values which are described below:

  • If the ch is a blank character, then a non-zero value is returned.
  • If it is not then 0 is returned.

Below programs illustrate the above function.

Program 1:

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// Program to illustrate
// isblank() function
#include <cwctype>
#include <iostream>
using namespace std;
  
int main()
{
  
    wchar_t ch1 = ' ';
    wchar_t ch2 = 'i';
  
    // check if character is blank or not 
    if(isblank(ch1))
     cout << "ch1 is blank \n"
    else 
      cout << "ch1 is not blank\n";
      
    // check if character is blank or not 
     if(isblank(ch2))
     cout << "ch2 is blank \n"
    else 
     cout << "ch2 is not blank\n";
  
    return 0;
}

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Output:

ch1 is blank 
ch2 is not blank

Program 2:

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// Program to illustrate
// isblank() function
#include <cwctype>
#include <iostream>
using namespace std;
  
int main()
{
  
    wchar_t ch1 = '3';
    wchar_t ch2 = ' ';
  
    // check if character is blank or not 
    if(isblank(ch1))
     cout << "ch1 is blank \n"
    else 
      cout << "ch1 is not blank\n";
      
    // check if character is blank or not 
     if(isblank(ch2))
     cout << "ch2 is blank \n"
    else 
     cout << "ch2 is not blank\n";
  
    return 0;
}

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Output:

ch1 is not blank
ch2 is blank


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