第二章第五题（金融应用：计算小费）(Financial application: calculate tips)

*2.5（金融应用：计算小费）编写一个程序，读入一笔费用与小费利率，计算小费和总钱数。例如，如果用户输入10作为费用，15%作为小费利率，计算结果显示小费$1.5,总费用为$11.5。

下面是一个运行示例：
Enter the subtotal and a gratuity rate: 10 15
The gratuity is $1.5 and total is $11.5

*2.5(Financial application: calculate tips) Write a program that reads the subtotal and the gratuity rate and then computes the gratuity and total.for example,if the user enters 10 for subtotal and 15% for gratuity rate, the program displays $1.5 as gratuity and $11.5 as total.

Here is a sample run:
Enter the subtotal and a gratuity rate: 10 15
The gratuity is $1.5 and total is $11.5

下面是参考答案代码:

import java.util.*;

public class CalculateGratuityQuestion5 {
	public static void main(String[] args) {
		int subtotal,gratuity_rate;
		double gratuity,cost_total;
		
		System.out.print("Enter the subtotal and a gratuity rate:");
		Scanner input = new Scanner(System.in);
		
		subtotal = input.nextInt();
		gratuity_rate = input.nextInt();
		
		gratuity = 0.01 * subtotal * gratuity_rate;
		cost_total = subtotal + gratuity;
		
		System.out.println("The gratuity is $" + gratuity + " and total is $" + cost_total);
	}
}

运行结果：

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）