/***********************/
/* slow.c 1.00         */
/* by Adam M. Costello */
/* <amc@cs.wustl.edu>  */
/*                     *************/
/* slow [ n ]                      */
/* Copies its stdin to its stdout, */
/* inserting n NULs before each    */
/* character.  If n is not given,  */
/* it defaults to 1.               */
/***********************************/

/* This is ANSI C code. */


#include <stdio.h>
#include <stdlib.h>


main(int argc, char **argv)
{
  int n, c, i;

  if (argc > 2) {
    fputs("Usage:\nslow [ n ]\n", stderr);
    exit(EXIT_FAILURE);
  }

  n = argc > 1  ?  atoi(argv[1])  :  1;

  for (;;) {
    c = getchar();
    if (c == EOF) break;
    for (i = 0;  i < n;  ++i)
      putchar('\0');
    putchar(c);
  }

  exit(EXIT_SUCCESS);
}