Question

现在这个问题可能在此之前被问过，但我找不到了。所以我道歉。

出于某种原因，我的代码似乎运行了两次，即使通过代码我只要求输入一次。有人可以指导我搞错吗？

感谢。

import java.util.Scanner;

public class BMI 
{

    static Scanner kybd = new Scanner(System.in);

public static void main(String[] args) 
{   
    System.out.println("Height in inches: " + heightInInches());
    System.out.println("Weight in pounds: " + weightInPounds());
    System.out.println(outputBMI(heightInInches(),weightInPounds()));
}

public static int heightInInches()
{

    System.out.print("Enter your height in feet: ");
    int feet = kybd.nextInt(); 

    //feet validation
    while(feet < 2 || feet > 7)
    {
        System.out.println("Input not vaild.");

        System.out.print("Enter your height in feet: ");
        feet = kybd.nextInt();
    }

    System.out.print("Enter your height in inches: ");
    int inches = kybd.nextInt();

    //inches validation
    while(inches < 0 || inches > 13){
        System.out.println("Input not vaild.");
        System.out.print("Enter your height in inches: ");
        inches = kybd.nextInt();
    }

    int totalInches = inches + (feet * 12);

    return totalInches;

}

public static int weightInPounds()
{
    System.out.print("Enter your weight in stone: ");
    int stone = kybd.nextInt();

    //stone validation
    while(stone < 3 || stone > 30)
    {
        System.out.println("Input invalid.");
        System.out.print("Enter your height in stone: ");
        stone = kybd.nextInt();
    }

    System.out.print("Please enter your weight in pounds: ");
    int pounds = kybd.nextInt();

    //pounds validation
    while(pounds < 0 || pounds > 30)
    {
        System.out.println("Input invalid.");
        System.out.print("Please enter your weight in pounds: ");
        pounds = kybd.nextInt();
    }

    int totalPounds = pounds + (stone * 14);

    return totalPounds;
}

public static double outputBMI(double height, double weight)
{
    double BMI = (weight * 703)/(height/height);

    return BMI;
}

}

Answer 1

正如评论中提到的那样，您需要只调用一次Helper!A1和heightInInches并将值存储在main方法的某些局部变量中，然后在需要的地方重用这些变量。例如，您可以像这样更新主要方法：

weightInPounds

Java程序在没有提示的情况下循环两次

1 个答案: