Java Homeowork 2 (Due 11/3/2014)?

[syasya]

Question :create a n application containing an array that stores 20 proces such as RM2.34, RM7.89 and so on. The application should display the sum of all the prices , display all values less than 5.00 , calculate average price and display all values higher than calculated average.

Requirement : I need your help for modification which can input prices by user input.
For mine program i make the prices static.

Code :

    public class PricesArray {
     // declare the prices array
    private static double[] prices = new double[20];

    public static void main(String[] args) {
        // fill the array with sample prices
        prices[0] = 5.5;
        prices[1] = 7.36;
        prices[2] = 9.22;
        prices[3] = 2.47;
        prices[4] = 12.54;
        prices[5] = 14.99;
        prices[6] = 12.2;
        prices[7] = 54.78;
        prices[8] = 62.14;
        prices[9] = 14.99;
        prices[10] = 2.50;
        prices[11] = 33.78;
        prices[12] = 98.98;
        prices[13] = 22.47;
        prices[14] = 78.32;
        prices[15] = 3.05;
        prices[16] = 11.35;
        prices[17] = 25.73;
        prices[18] = 8.88;
        prices[19] = 54.92;

        // display the sample values:
        System.out.print("Prices:\n");
        for (int i = 0; i < 20; i++) {
            System.out.println("$" + prices[ i ]);
        }

        // display the sum of all prices
        System.out.printf("\nSum: $%.2f\n\n", sum());

        // display all values less than $5.00
        System.out.printf("Values less than $5.00:\n%s\n", valuesLessThan5());

        // display the average of the prices
        System.out.printf("Average of the prices: $%.2f\n\n", average());

        // display all values that are higher than the calculated average value
        System.out.printf("Values higher than the average:\n%s\n",
               valuesHigherThanAverage());
    }

    // returns the sum of all prices
    private static double sum() {
        double total = 0;
        for (int i = 0; i < 20; i++) {
            total += prices[ i ];
        }
        return total;
    }

    // returns all values less than $5.00
    private static String valuesLessThan5() {
        String values = "";
        for (int i = 0; i < 20; i++) {
            if (prices[ i ] < 5.00) {
               values += "$" + prices[ i ] + "\n";
            }
        }
        return values;
    }

    // returns the average of the prices
    private static double average() {
        return sum() / 20.00;
    }

    // returns all values that are higher than the calculated average value
    private static String valuesHigherThanAverage() {
        double avg = average();
        String values = "";
        for (int i = 0; i < 20; i++) {
            if (prices[ i ] > avg) {
               values += "$" + prices[ i ] + "\n";
            }
        }
        return values;
    }
}

[rubberman]

So, you want us to do your homework for you? Make an effort to solve the problem and we can help you. This is not sufficient... :-(

[stultuske]

what is it you don't know how to do? adding the numbers up? calculating an average?

[Alberto Bucur]

Hi,

First put in top of your program this line:

import java.util.Scanner; 

Second, replace your filling of array with this:

Scanner in = new Scanner(System.in);   // Construct a Scanner object 
for(int k = 0; k<20; k++)
{
    price[k] = in.nextDouble();
}