#include <stdio.h>
/* Print the squares from 0 upwards
   Name the file squares.c 
   Usage: gcc -o squares squares.c
   squares
   .. or
   squares n
   RPJ 28xii10
*/
int main(argc, argv) 
     int argc;
     char * argv[];
{
  int i;
  int n = 10;    /* default */
  if (argc > 1) n = atoi(argv[1]);
  for (i = 0; i < n; i++) {
    printf("%d squared is %d\n", i, i*i);
  }
}