C Tutorial/ctype.h/iscntrl

iscntrl

Item Value Header file ctype.h Declaration int iscntrl(int ch); Return returns nonzero if ch is a control character or zero is returned.

<source lang="cpp">#include <ctype.h>

 #include <stdio.h>
 int main(void)
 {
   char ch;
   for(;;) {
      ch = getchar( );
      if(ch == ".") {
         break;
      }
      if(iscntrl(ch)){
         printf("%c is a control char\n", ch);
      }
   }
   return 0;
 }</source>