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

# define DEBUG(fmt, ...) fprintf ( stderr, fmt, __VA_ARGS__ )
//
//  Program 18.3, Stephen Kochan, Programming in C.
//
int main ( int argc, char *argv[] );
int process ( int i1, int i2 );

int main ( int argc, char *argv[] )
{
  int arg1, arg2;

  if ( 2 <= argc )
  {
    arg1 = atoi ( argv[1] );
  }
  else
  {
    arg1 = 0;
  }

  if ( 3 <= argc )
  {
    arg2 = atoi ( argv[2] );
  }
  else
  {
    arg2 = 0;
  }

#ifdef DEBUG
  fprintf ( stderr, "processed %i arguments\n", argc - 1 );
  fprintf ( stderr, "arg1 = %i, arg2 = %i\n", arg1, arg2 );
#endif

  printf ( "%i\n", process ( arg1, arg2 ) );

  return 0;
}


int process ( int i1, int i2 )
{
  int val;

  DEBUG("process (%i %i)\n", i1, i2 );

  val = i1 * i2;

  DEBUG("return %i\n", val );

  return val;
}