What is iswblank in C?
To use the iswblank function, you will need to include the <wctype.h> library in the program, as shown below:
#include <wctype.h>
The prototype of the iswblank function is shown below:
int iswblank(wint_t ch);
Note: The
wint_tdata type shown above refers to awide integerin C.
Parameters
The iswblank function takes a single mandatory parameter of the wide integer data type.
Return value
If the argument passed to the iswblank function is a blank character, then the function returns a non-zero integer; otherwise, it returns .
Example
The code below shows how the iswblank function works in C:
#include <stdio.h>#include <wctype.h>#include <wchar.h>int main() {// initializing stringwchar_t str[] = L"Count the number of blanks in the sentence";// initializing counterint blanks = 0;// extracting charactersfor(int i = 0; i < wcslen(str); i++){// checking blank characterif(iswblank(str[i])){blanks++;}}printf("The string contains %d blank characters.", blanks);return 0;}
Explanation
First, the code initializes a character array. The ‘L’ identifier in line 8 informs the compiler that the Unicode character set is being used. Additionally, a counter variable, blanks, is initialized to store the number of blank characters present in the array.
A for-loop iterates over the array and extracts each character. The wcslen function calculates the array’s length so that the loop can terminate correctly.
Each extracted character is provided as an argument to the iswblank function in line 18. The iswblank function proceeds to check if the character is blank and updates the counter accordingly.
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