java 使用 for 循环仅读取 5 个数字并取平均值。爪哇

Using a for loop to read ONLY 5 numbers and average them. JAVA

提问by Slowp Powl

Really having issues with this program I'm making. I've searched this site and a few others, although have yet to find a solution. It may look like I'm just soliciting help but I truly am stuck. I am to make a program that reads in 5 numbers from the user and average those numbers. My extent of knowledge of Java is the Scanner class and for loops, yet haven't used while loops yet. Here is the very poorly written code:

我正在制作的这个程序真的有问题。我已经搜索了这个网站和其他一些网站，但还没有找到解决方案。看起来我只是在寻求帮助，但我真的被卡住了。我要制作一个程序，从用户那里读取 5 个数字并平均这些数字。我对 Java 的了解程度是 Scanner 类和 for 循环，但还没有使用过 while 循环。这是写得很糟糕的代码：

public class Average5
{
   public static void main(String args[])
{
   Scanner sc = new Scanner(System.in);
   int num;

   System.out.print("Please enter a number: ");
   num = sc.nextInt();

   for(int num1 = 0; num1 <= num; num1++)
   {
        System.out.print("Please enter a number: ");
        num = sc.nextInt();
   }

I honestly have no clue what to do. More or less self taught.

老实说，我不知道该怎么做。或多或少是自学的。

回答by Madhawa Priyashantha

public class Average5 {

    public static void main(String args[]) {

        int numlenngth = 5;
        double total = 0;
        Scanner sc = new Scanner(System.in);

        for (int num1 = 0; num1 < numlenngth; num1++) {
            System.out.print("Please enter a number: ");
            total += sc.nextInt();
        }

        System.out.println("Average : " + (total / numlenngth));

    }
}

output >>

输出 >>

Please enter a number: 1
Please enter a number: 1
Please enter a number: 1
Please enter a number: 1
Please enter a number: 2
Average : 1.2

回答by Soxfmr

Here you can use the array to store the numbers:

在这里，您可以使用数组来存储数字：

public class Average5 {
    private static final int MAX = 5;

    public static void main(String[] args) {
        int[] numbers = new int[MAX];
        Scanner sc = new Scanner(System.in);

        for(int i = 0; i < MAX; i++) {
            System.out.println("Please type the number");
            numbers[i] = sc.nextInt();
        }

        float average = getAverage(numbers);
        System.out.println("The average of the five numbers: " + average);
    }

    public static float getAverage(int[] arg0) {
        int sum = 0;
        float Ret = 0.0f;

        if(arg0 != null) {
            for(int i = 0; i < MAX; i++) {
            sum += arg0[i];

            Ret = sum / MAX;
        }

        return Ret;
    }
}

This is not the only way to slove this problem.

这不是解决这个问题的唯一方法。

回答by stevecross

This is almost the same as the others posted, but it is limited to entering only 5 numbers and it takes care of possibly resulting floating number in the final division:

这与其他发布的几乎相同，但仅限于输入 5 个数字，并且它会处理最终划分中可能产生的浮点数：

import java.util.Scanner;

public class Average5 {

    private static final int TOTAL = 5;

    public static void main(final String[] args) {
        final Scanner scanner = new Scanner(System.in);
        double sum = 0;

        System.out.format("You have to enter %d numbers now.\n", TOTAL);

        for (int cnt = 1; cnt <= TOTAL; cnt++) {
            System.out.format("Please enter number %d of %d: ", cnt, TOTAL);
            sum += scanner.nextInt();
        }

        System.out.format("The average is %f.\n", sum / TOTAL);
        scanner.close();
    }

}

回答by Shoaib Chikate

For calculating exact average, you need to take double(sum) instead of int and add(sum) everytime with the user value.

为了计算精确的平均值，您需要每次使用用户值都使用 double(sum) 而不是 int 和 add(sum)。

public class Average5
{
   public static void main(String args[]){
   Scanner sc = new Scanner(System.in);
   System.out.print("Please enter how many numbers you want to enter for calculating average: ");
   int totalCount = sc.nextInt();
   double sum=0;

   for(int i= 0; i<totalCount; i++)
   {
        System.out.print("Please enter a number: ");
        sum += sc.nextDouble();
   }

   System.out.println("Average of number is"+(sum/totalCount));

}

回答by Gurkan ?lleez

int num = 0;
float total = 0f;
Scanner sc = new Scanner(System.in);
System.out.print("Please enter a number: ");
num = sc.nextInt();

for(int num1 = 0; num1 <= num; num1++)
   {
        System.out.print("Please enter a number: ");
        total += sc.nextInt();
   }

System.out.println("Average : "+(total/num));