C/ctype.h/isblank

int isblank(int ch)

<source lang="cpp">

//Declaration: int isblank(int ch); //Return: returns nonzero if ch is blank.

               By default, the blank characters are space and horizontal tab. 
 #include <ctype.h>
 #include <stdio.h>
 int main(void)
 {
   char ch;
   for(;;) {
      ch = getchar();
      if(ch == ".") {
         break;
      }
      if(isblank(ch)){
          printf("%c is a word separator\n", ch);
      }
   }
   return 0;
 }
        

/* q q is a letter w w is a letter q q is a letter .

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      </source>