2.4（将磅转换为千克）编写程序，将磅数转换为千克数。程序提示用户输入磅数，然后转换成千克并显示结果。1磅等于0.454千克。

下面是一个运行示例：
Enter a number in pounds:55.5
55.5 pounds is 25.197 kilograms

2.4(convert pounds to kilograms) Write a program that converts pound to kilogram.The program prompts the user to enter a number in pound, converts it to kilogram, and displays the result. one pound is 0.454 kilograms.

Here is a simple run:
Enter a number in pounds:55.5
55.5 pounds is 25.197 kilograms

下面是参考答案代码:

import java.util.*;public class ConvertPoundToKilogramQuestion4 {public static void main(String[] args) {double pound,kilogram;System.out.print("Enter a number in pounds : ");Scanner pound_input = new Scanner(System.in);pound = pound_input.nextDouble();kilogram = pound * 0.454;System.out.println(pound + " pounds is " + kilogram + " kilograms");pound_input.close();}
}

运行效果：

注：编写程序要养成良好习惯
如：1.文件名要用英文，具体一点
2.注释要英文
3.变量命名要具体，不要抽象（如:a,b,c等等），形式要驼峰化
4.整体书写风格要统一（不要这里是驼峰，那里是下划线，这里的逻辑段落空三行，那里相同的逻辑段落空5行等等）