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iswcntrl() function in C++ STL
The iswcntrl () function in C++ standard template library(STL) is used to check if the given wide character is a control character or not. A control character is a character in C/C++ that won’t occupy a printing position on a display screen. Iswcntrl() function is defined in a cwctype header file.
Syntax of iswcntrl() function is as follows
int iswcntrl (wint_t c)
Parameters − c − This is the character to be checked.
Return Value − A value different from zero (i.e.. a non-zero value) if c is a control character else a zero value.
Approach used in the below program is as follows
- Input the string or character from the user
- Traverse the loop till the control character is not found
- Display the string till the first control character is not found
- Exit from the loop when the first control character is examined
Example-1
#include <stdio.h>
#include <wctype.h>
int main (){
int i=0;
wchar_t str[] = L"first line \n second line \n";
while (!iswcntrl(str[i])) {
putchar (str[i]);
i++;
}
return 0;
}Output
If we run the above code it will generate the following output −
First line
Example-2
#include <stdio.h>
#include <wctype.h>
int main (){
int i=0;
wchar_t str[] = L"first linesecond line \nthird line";
while (!iswcntrl(str[i])) {
putchar (str[i]);
i++;
}
return 0;
}Output
If we run the above code it will generate the following output −
First linesecond line
Updated on: 30-Jan-2020
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