java - 无论 num1、num2 或 num3 输入什么，总分始终等于 0.0

Question

这句话有什么问题吗？它总是输出0.0而不是总分结果

import java.util.Scanner;

public class d {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);

        int num1;
        int num2;
        int num3;
        int percentnum1;
        int percentnum2;
        int percentnum3;
        double totalscore;

        System.out.print("Enter paper 1 score (out of 90): ");
        num1 = input.nextInt();

        System.out.print("Enter paper 2 score (out of 90): ");
        num2 = input.nextInt();

        System.out.print("Enter IA score (out of 20): ");
        num3 = input.nextInt();

        percentnum1 = (num1 / 90) * 100;
        percentnum2 = (num2 / 90) * 100;
        percentnum3 = (num3 / 20) * 80;

        totalscore = (percentnum1 * 0.4) + (percentnum2 * 0.4) + (percentnum3 * 0.2);

        System.out.println("The total score is " + totalscore);


    }
}

Answer 1

将int更改为doubleto avoid rounding down to 0 .