C language isspace() function: determine whether a character is a blank character

Function name : isspace

Header file : <ctype.h>

Function prototype : int isspace(int ch);

Function : Determine whether the character is a blank character

Parameters : int ch character to be checked

Return value : If ch is not a blank character, 0 is returned. If ch is a blank character, non-0 is returned.

Program example : Determine whether the entered character is a punctuation mark

 #include<ctype.h>#include<stdio.h>intmain(){charchprintf(inputacharacter:);scanf(%c,&ch);if(isspace(ch)){printf(%cisspace.,ch);} else{printf(%cisnotspace.,ch);}putchar('n');return0;}

Running results:

 inputacharacter:isspace.