Question

我一直在尝试制作一个计算9个数字平均值的基本计算器。问题是它总是跳过最后一行。我的代码：

/* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package avarage.calc;
import java.util.Scanner;
/**
 *
 * @author taine
 */
public class AvarageCalc {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        Scanner input = new Scanner(System.in);
        double num1;
        double num2;
        double num3;
        double num4;
        double num5;
        double num6;
        double num7;
        double num8;
        double num9;
        double num10;
        double ans;
        System.out.print("Enter Number #1:");
        num1 = input.nextDouble();
        System.out.print("Enter Number #2:");
        num2 = input.nextDouble();
        System.out.print("Enter Number #3:");
        num3 = input.nextDouble();
        System.out.print("Enter Number #4:");
        num4 = input.nextDouble();
        System.out.print("Enter Number #5:");
        num5 = input.nextDouble();
        System.out.print("Enter Number #6:");
        num6 = input.nextDouble();
        System.out.print("Enter Number #7:");
        num7 = input.nextDouble();
        System.out.print("Enter Number #8:");
        num8 = input.nextDouble();
        System.out.print("Enter Number #9:");
        num9 = input.nextDouble();
        ans = num1 + num2 + num3 + num4 + num5 + num6 + num8 + num9;
        System.out.println("The Average of the numbers you gave is:" + ans / 9);
    }
}

程序运行时：

run:
Enter Number #1:20
Enter Number #2:20
Enter Number #3:20
Enter Number #4:20
Enter Number #5:20
Enter Number #6:20
Enter Number #7:20
Enter Number #8:20
Enter Number #9:20
The Average of the numbers you gave is:17.77777777777778
BUILD SUCCESSFUL (total time: 10 seconds)

Answer 1

您的平均值不正确，因为您的金额中缺少num7

ans = num1 + num2 + num3 + num4 + num5 + num6 + num8 + num9;

应该是

ans = num1 + num2 + num3 + num4 + num5 + num6 + num7 + num8 + num9;

Answer 2

你有10个变量，但你计算平均值为9.它是你想要的吗？无论如何，@ the-tom已经证明了你的错误。您已经忘记了num7变量。
您获得错误的代码越少，错误就越少。

做这样的事情可能会更好：

double ans = 0;
Scanner input = new Scanner(System.in);
int x = 9 //Or some other number
for(int i = 1; i <= x; i++){
    System.out.print("Enter Number #" + i);
    ans += input.nextDouble();
}

System.out.println("The Average of the numbers you gave is:" + ans / x);

现在，如果您需要计算20个元素的平均值，您只需将x的值设置为20。

Java跳过最后一个变量

2 个答案: