C/ctype.h/iscntrl

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int iscntrl(int ch)

//Declaration:  int iscntrl(int ch); 
//Return:       returns nonzero if ch is a control character or zero is returned. 
  #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;
  }
         
/*
1
 is a control char
2
 is a control char
3
 is a control char
.
*/