Java 代码

/**4 MDKJ
"The old question 'Is it in the database?' will be replaced by 'Is it on the blockchain?'"
    -- William Mougayar
*/
import java.util.Scanner;

public class Main
{
    public static void main (String[] args)
    {
        Scanner cin = new Scanner(System.in);

        double total = 0;

        for (int i = 0; i < 2; i ++)
        {
            cin.nextInt(); // product #
            total += cin.nextInt() * cin.nextDouble();
        }

        System.out.println ("VALOR A PAGAR: R$ " + String.format("%.2f", total));
    }
}