要求

总评成绩 = 期末成绩*0.6 + 平时成绩*0.4

输入总评成绩和平时成绩，输出期末成绩要考几分（0<=平时成绩<=40，0<=总评成绩<=100）

要求能多次运行（退出程序停止）

代码

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.print("输入你想要的成绩：");
            int overallScores = scanner.nextInt();  //输入想要的总评成绩
            if (overallScores > 100 || overallScores < 0) { //判断总评成绩是否有误
                System.out.println("总评成绩有误，请重新");
                System.out.println("------------------------");
                continue;
            }
            System.out.print("输入你的平时成绩：");
            int usualScores = scanner.nextInt();    //输入平时成绩
            if (usualScores > 40 || usualScores < 0) {  //判断平时成绩是否有误
                System.out.println("平时成绩有误，请重新");
                System.out.println("------------------------");
                continue;
            }
            System.out.printf("你期末需要考%.1f分\n", (overallScores - usualScores) / 0.6);
            System.out.println("------------------------");
        }
    }
}

运行结果