Question

我见过几个平均计算器，但没有一个具有这个特定的功能。基本上，我想问一下“你想平均多少个数字？”然后“输入您的号码”并在每次输入后继续提示“输入您的号码”，直到满足“多少号...”数量。我知道这是一个计数循环（对不起，如果我的行话是关闭的......我只是在我的第二学期计算机编程）但我不知道如何设置它。提前感谢您的回答。这是我到目前为止所做的：

import java.util.Scanner;

public class TestScoreApp
{
    public static void main(String[] args)
    {
        // welcome the user to the program
        System.out.println("Welcome to the Test Average Calculator!");
        System.out.println();  // print a blank line
        // display operational messages
        System.out.println("Please enter test scores that range from 0 to 100.");
        System.out.println();  // print a blank line

        // initialize variables and create a Scanner object
        int scoreTotal;
        int scoreCount;
        int testScore;
        Scanner sc = new Scanner(System.in);

        // perform calculations until choice isn't equal to "y" or "Y"
        String choice = "y";
        while (!choice.equalsIgnoreCase("n"))
        {
            // get the number of grades to be averaged from the user
            System.out.print("How many scores would you like to average? ");
            scoreCount = sc.nextInt();

            // get the input from the user
            System.out.print("Enter score: ");
            testScore = sc.nextInt();

            // accumulate score count and score total
            if (testScore <= 100)
            {
                scoreTotal = scoreTotal + testScore;
            }
            else if (testScore >= 100)
                System.out.println("Invalid entry, not counted");


        // display the score count, score total, and average score
        double averageScore = scoreTotal / scoreCount;
        String message = "\n" +
                         "Score count:   " + scoreCount + "\n"
                       + "Score total:   " + scoreTotal + "\n"
                       + "Average score: " + averageScore + "\n";
        System.out.println(message);

        System.out.print("Would you like to average more grades? (y/n): ");
            choice = sc.next();
            System.out.println();
        }
    }
}

Answer 1

所以你想平均scoreCount个项目，或者在用户输入“n”之前保持平均值？

如果这是第一种情况（正如您在问题中所述）并且您希望平均scoreCount次，则需要更改while循环的条件。

System.out.print("How many scores would you like to average? ");
scoreCount = sc.nextInt();
scoreTotal = 0;
for(int i=0; i<scoreCount; i++){
     scoreTotal += sc.nextInt();
     System.out.print("Okay please enter next...");        
}
System.out.print("Average is " + scoreTotal/scoreCount);

如果你想用while来做，只需保留一个索引int index=0;，在每次迭代时递增索引并检查你是否超过索引。

while (index < scoreCount)
    scoreTotal += sc.nextInt();
    index++;
System.out.print("Average is " + scoreTotal/scoreCount);

Answer 2

除了一些错误之外，你的方法几乎是正确的。您希望在按下'n'之前接受输入，然后显示平均值。这意味着当输入结束时，平均值计算必须在循环外完成。

如果您想从输入而不是'y'/'n'方法获取预定义数字的输入，您可以重复使用while循环：

int numOfInput = sc.nextInt(); // how many number will be entered 
while(numOfInput > 0) {
   // take every input and add to total
   --numOfInput;
}
// average calculation

此外，输入验证检查中存在一些逻辑错误。

if (testScore <= 100) // for less or equal 100
{
    scoreTotal = scoreTotal + testScore;
}
else if (testScore >= 100) // for greater or equal 100
    System.out.println("Invalid entry, not counted");

两个条件都检查数字是否等于100 ，这是不期望的。如果您只允许小于100的数字，那么您可以写：

if (testScore < 100) {
    scoreTotal += testScore;
}
else {
    System.out.println("Invalid entry, not counted");
}

Answer 3

这就是你所需要的：

for( int i = 0; i < scoreCount; i++){
    System.out.print("Enter score: ");    
    testScore = sc.nextInt();
}

for循环创建整数 i 以保存其循环索引

int i;

每个循环要求 i 大于 scoreCount ，如果不再循环。

i < scoreCount;

在每个循环之后，它将一个添加到 i 。

i++

具有定义条目数的Java平均计算器

3 个答案: