Java 代码

import java.util.Scanner;

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

        double avg = cin.nextDouble() * 0.2;
        avg += cin.nextDouble() * 0.3;
        avg += cin.nextDouble() * 0.4; 
        avg += cin.nextDouble() * 0.1; 

        System.out.println("Media: " + String.format("%.1f", avg));

        if (avg > 7.0)
            System.out.println("Aluno aprovado.");
        else if (avg < 5.0)
            System.out.println("Aluno reprovado.");
        else
        {
            System.out.println("Aluno em exame.");

            double y = cin.nextDouble();
            System.out.println("Nota do exame: " + y);

            avg = (avg + y)/2;
            if (avg >= 5.0)
                System.out.println("Aluno aprovado.");
            else
                System.out.println("Aluno reprovado.");
            System.out.println ("Media final: " + String.format("%.1f", avg));
        }
    }
}