#include <stdio.h>

int square( int x )
{
  return(x*x);
}


main( int argc, char *argv[]) {

  int n,nn;
  if (argc!=2) {
    fprintf(stderr,"ERROR, no argument\n");
    exit(0);
  }

  n = atoi(argv[1]);
  nn = square(n);
  printf("The square of %d is %d\n",n,nn);
  return(0);
}