Java中的简单计算器程序。读取的整数和平均值 [英] Simple calculator program in Java. No. of integers read and Average

问题描述

我有一项任务要求我打印出以下数量：

I have a task that requires me to print out the following quantities:

我需要编写一个可以计算的java程序：
1. the在
中读取的整数数量2.平均值 - 不必是整数！

I need to write a java program that can calculate: 1. the number of integers read in 2. the average value—which need not be an integer!

我的最终输出应如下所示：

My final output should look like:

$ javac SimpleCalc 
$ java SimpleCalc 3 4 6 8 1 
5
8
4.4 
7

我知道我需要使用扫描仪类来读取用户输入然后，我不知道如何让它显示计数。我认为我可以解决这个问题，我可以通过将数字相加来计算平均值，并将输入的整数除以平均值。

I know i need to use a scanner class to read then as the user inputs then, i dont know how to make it display a count. I think that i can work this out, i can compute the average by adding up the numbers and divide the toal by the number of integers entered.

然而这是我的第一次写一个程序，这是我的头脑。任何帮助将不胜感激，甚至接受伪代码，如果它有助于我弄清楚如何处理它。

However its my first time writing a program, and this is doing my head in. Any help would be appreciated, ill even accept pseudocode if it helps me work out how to approach this.

推荐答案

在这里你应该使用 main 函数的参数：

Here you are supposed to use the arguments of the main function:

public class PrintArgs {
    public static void main (String[] args) {
        for (int i = 0; i<args.length; ++i) {
          System.out.println("Args " + (i + 1) + " is " + args[i]);
        }
    }
}

将此类保存在文件中叫 PrintArgs.java 并使用 javac 编译它：

Save this class in a file called PrintArgs.java and compile it using javac:

$ javac PrintArgs.java

使用生成的类文件运行 java ：

Run the generated class file using java:

$ java PrintArgs hello world
Args 1 is hello
Args 2 is world

$ java PrintArgs 3 4 6 8 1 
Args 1 is 3
Args 2 is 4
Args 3 is 6
Args 4 is 8
Args 5 is 1

现在你知道如何读取用户的输入。要将 String 转换为 int ，请使用 parseInt 方法整数类：

Now you know how to read input from the user. To convert a String to int, use the parseInt method of the Integer class:

int i = Integer.parseInt("980");
System.out.println(100 + i); // => 1080

现在您知道如何编写计算器程序了！

Now you know how to write your calculator program!

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