Question

当你运行代码时，它只会告诉你每次体重都不足，即使体重指数不低于体重。

public class BMI_Calc 
{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("This program computes your BMI");
        System.out.print("What is first your name? ");
        String name  = sc.next();
        System.out.print("Enter your weight in pounds: ");
        double weight = sc.nextDouble();
        System.out.print("Enter your height in inches: ");
        double height = sc.nextDouble();
        double new_weight = weight*703;
        double new_height = height * height;
        double bmi = new_weight/new_height;
        boolean isUnderweight;
        boolean isNormalweight;
        boolean isOverweight;
        boolean isObese;

        System.out.println("Dear " + name + ", your BMI is " + bmi +" and you are under weight.");
        bmi = sc.nextDouble();
        isUnderweight = (bmi<=18.5);

        System.out.println("Dear " + name + " your BMI is " + bmi +" and you are normal weight.");
        bmi = sc.nextDouble();
        isNormalweight = (bmi>18.5&&bmi<24.9);

        System.out.println("Dear " + name + " your BMI is " + bmi +" and you are over weight.");
        bmi = sc.nextDouble();
        isOverweight = (bmi>24.9&&bmi<29.9);

        System.out.println("Dear " + name + " your BMI is " + bmi +" and you are obese.");
        bmi = sc.nextDouble();
        isObese = (bmi>=30.0);

        sc.close();

    }

为什么我的所有布尔类型都会运行并给出单独的结果？

任何人都可以帮忙解决这个问题吗？

Answer 1

您的代码卡在体重不足的原因是因为您之后要求输入。要求输入会停止程序，直到您输入输入。请尝试改为使用此代码：

 public class BMI_Calc.java
    {
        public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            System.out.println("This program computes your BMI");
            System.out.print("What is first your name? ");
            String name  = sc.next();
            System.out.print("Enter your weight in pounds: ");
            double weight = sc.nextDouble();
            System.out.print("Enter your height in inches: ");
            double height = sc.nextDouble();
            double new_weight = weight*703;
            double new_height = height * height;
            double bmi = new_weight/new_height;
            boolean isUnderweight = (bmi<=18.5);
            boolean isNormalweight = (bmi>18.5&&bmi<24.9);
            boolean isOverweight = (bmi>24.9&&bmi<29.9);
            boolean isObese = (bmi>=30.0);

            if(isUnderweight){
                System.out.println("Dear " + name + ", your BMI is " + bmi +" and you are under weight.");
            }else if(isNormalweight){
                System.out.println("Dear " + name + " your BMI is " + bmi +" and you are normal weight.");
            }else if(isOverweight){
                System.out.println("Dear " + name + " your BMI is " + bmi +" and you are over weight.");
            }else if(isObese){
                System.out.println("Dear " + name + " your BMI is " + bmi +" and you are obese.");
            }

            sc.close();

        }

为什么我的所有布尔类型都会运行并给出单独的结果？

1 个答案: