Calculate average of N numbers

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Java

Scanner sc = new Scanner(System.in);
        int num;

        int sum = 0;
        do {
            System.out.println("Enter the number: ");
            num = sc.nextInt();
            sum += num;
            System.out.println("Enter 0 to end the loop: ");
        }while (num != 0);
        System.out.println("sum is "+sum);

        int avg = sum / num;
        System.out.println("average is "+avg);

What I have tried:

i am not able to get the average value of the numbers entered by the user
it is showing "

Exception in thread "main" java.lang.ArithmeticException: / by zero

"

Posted 7-Nov-22 2:31am

Sohaib Samad

Updated 7-Nov-22 21:41pm

CPallini

v2

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Richard Deeming · Answer 1 · 2022-11-07T02:42:00

Your loop terminates when num is equal to 0.

You then try to divide the sum by num, which will (obviously) give you a "divide by zero" error.

You need a separate variable to keep track of how many numbers the user has entered.

You'll also need to convert at least one side of the division to a floating-point number; otherwise, Java will perform an "integer division", truncating the result to fit in an integer. For example, using integers, the average of 1 and 2 would be 1, which is clearly not correct.

Patrice T · Answer 2 · 2022-11-07T08:39:00

Solution 2

Quote:
i am not able to get the average value of the numbers entered by the user

You need to count the number of value typed by user !
num is only the user input, and user typed 0 in order to exit the loop.

Posted 7-Nov-22 8:39am

Patrice T

Mirzakhmet Syzdykov · Answer 3 · 2022-11-07T21:41:00

Hi,

First of all there's error in your code.

The average for n numbers will be sum divided by the count of this numbers.

So your program hangs on the last entered zero.

I'd like to re-write it as follows:

Java

Scanner sc = new Scanner(System.in);
        int num;

        int sum = 0;
        int count = 0;

        do {
            System.out.println("Enter the number: ");
            num = sc.nextInt();
            sum += num;
            System.out.println("Enter 0 to end the loop: ");

            if (num != 0) count = count + 1;
        }while (num != 0);
        System.out.println("sum is "+sum);

        float avg = sum;

        if (count > 0) avg = avg / count;

        System.out.println("average is "+avg);

Calculate average of N numbers

3 solutions

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Solution 2

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