#include <stdio.h> 
/* Define the trade structure */
struct trade {double price; int number;};
/* Define trade_price */
double trade_price (struct trade t) {
  return t.price * t.number;
}
/* Define trade array */
struct trade trades[3];
main ( ) {
  /* Wire in sample data */
  trades[0].price = 10.2; trades[0].number = 600;
  trades[1].price = 12.0; trades[1].number = 100;
  trades[2].price = 13.2; trades[2].number = 200;
  /* Display products */
  printf ("The trade prices are, %f, %f, and %f.\n",
          trade_price (trades[0]),
          trade_price (trades[1]),
          trade_price (trades[2]));
}