如何在do-while循环中找到平均值

Question

I have to write a program that asks the user to enter an integer value. After each value, the user has to respond with a "y" or a "n" if he/she wants to continue with the program, and each number the user enters is stated as either odd or even.

I have done this so far with a do-while loop, but I am confused on how to get the averages of the values the user enters. How would you get the average for all the numbers entered?

Here is my code so far:

import java.util.Scanner;
class ProgramTest {
    public static void main(String[] args) {
        String answer = "";

        do {

            int num, count = 0;
            Scanner scan = new Scanner(System. in );
            System.out.print("Enter any number : ");
            num = scan.nextInt();

            if ((num % 2) == 0) System.out.println(num + " is an even number.");
            else System.out.println(num + " is an odd number");
            System.out.println("do you want to continue?");
            answer = scan.next();
            count++;

        } while (answer.equals("y"));

    }
}

Answer 1

From the Question looks like following things need to handled,

1. haven't add mechanism for addition into single variable.
2. put all variable to out from do...while loop body...
3. created additional variable according to requirement.

see all this things covered by me with following code snippet.

do something likewise,

String answer = "";
double sum = 0; // use for storing addition to all entered values..
int num, count = 0;
 Scanner scan = new Scanner(System.in);

        do {
            System.out.print("Enter any number : ");
            num = scan.nextInt(); // getting input from user through console
            sum = sum + num; // add every input number into sum-variable
            if ((num % 2) == 0) System.out.println(num + " is an even number.");
            else System.out.println(num + " is an odd number");
            System.out.println("do you want to continue?");
            answer = scan.next(); // ask for still want to repeat..
            count++;

        } while (answer.equals("y"));
System.out.println("Average is : " + sum + "/" + count + " = "+ (sum /count));

Answer 2

In order to calculate Average, you need 2 things: Sum of all numbers and Count of all numbers involved in the Average calculation.

Your sum and count which involved in the Average calculation needs to be out of the do..while scope in order for them to be known at the calculation stage.

I also took the liberty of fixing your code a little bit

import java.util.Scanner;

class ProgramTest {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System. in );
        int count = 0;
        int sum = 0;
        String answer = "";
        do {
            System.out.print("Enter any number : ");
            int num = scan.nextInt();

            boolean isEven = (num % 2 == 0);

            System.out.println(num + " is an " + (isEven ? "even" : "odd") + " number.");
            sum += num;

            System.out.println("do you want to continue?");
            answer = scan.next();
            count++;
        } while (answer.toLowerCase().equals("y"));

        System.out.println("Average: " + (sum/count));
    }
}

Answer 3

Change your code like this:

  import java.util.Scanner;
    class ProgramTest {
        public static void main(String[] args) {
            String answer = "";
            int avr =0;
            int num, count = 0;
            do {

                Scanner scan = new Scanner(System. in );
                System.out.print("Enter any number : ");
                num = scan.nextInt();

                if ((num % 2) == 0) System.out.println(num + " is an even number.");
                else System.out.println(num + " is an odd number");
                System.out.println("do you want to continue?");
                avr += num;
                answer = scan.next();
                count++;

            } while (answer.equals("y"));
           avr = avr /count;
     System.out.println("The avreage of value is:" + avr );
        }
    }

avr is average. that means when you input an integer. we add num and avr . and when finish looping. we divideto count. like this:

1-5-9-11

avr = 1+5+9+11;

count = 4;

avr = avr/4;