Question

新错误：

import java.util.Scanner;

public class BMICalculator {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        System.out.print("Length in meters: ");
        double length = input.nextDouble();

        System.out.print("Weight in kilos: ");
        double weight = input.nextDouble();

        double bmi = weight / length * length;

        System.out.printf("BMI");

        input.close();
    }
}

Answer 1

您正在考虑变量meter和bmi是double类型。但是，赋值右侧的表达式是int之间的除法运算，这会导致精度损失。

您需要将右侧的操作数之一转换为两倍以保持精度。

double meter = (double) centimeter / 100;
double bmi = (double) weight / (meter * meter);

Answer 2

在您的System.out.printf中，您使用的是不存在的length变量。据我了解，那里应该有meter变量。

我还修复了System.out.print字首Length中的错字。

固定类如下（ UPDATE：还固定整数除法，这是实际问题的目标）：

import java.util.Scanner;

public class BMICalculator {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        System.out.print("Length in centimeter: ");
        int centimeter = input.nextInt();
        double meter = ((double) centimeter) / 100; // fixed integer division by casting to double

        System.out.print("Weight in whole kilo: ");
        int weight = input.nextInt();

        double bmi = ((double) weight) / (meter * meter); // fixed integer division by casting to double

        System.out.printf("BMI for someone who is %.2f meter long, and weight %d kilo is %.1f", meter, weight, bmi);

        input.close();
    }
}

这里应该是两个错误，但我看不到它们

2 个答案: