C language iscntrl() function: determine whether a character is a control character

Function name : iscntrl

Header file : <ctype.h>

Function prototype : int iscntrl(int ch);

Function : Determine whether a character is a control character

Parameters : int ch character to be checked

Return value : If ch is not a control character, return 0; if ch is a control character, return non-0.

Program example : Determine whether the entered character is a control character

 #include<ctype.h>#include<stdio.h>#include<conio.h>intmain(){charch;printf(inputacharacter:);ch=getche();if(iscntrl(ch)){printf( n%c%discontrolcharacter.,ch,ch);}else{printf(n%c%disnotcontrolcharacter.,ch,ch);}putchar('n');return0;}

Running results:

 inputacharacter:26iscontrolcharacter.