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Sunday, 6 November 2016

Chapter 11 Exercise 12, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

11.12 (Sum ArrayList) Write the following method that returns the sum of all numbers
in an ArrayList:
public static double sum(ArrayList<Double> list)
Write a test program that prompts the user to enter 5 numbers, stores them in an array list, and displays their sum.
import java.util.ArrayList;
import java.util.Scanner;

public class Exercise_12 {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);
        System.out.print("Enter 5 numbers: ");
        ArrayList<Double> list = new ArrayList<>();
        for (int i = 0; i < 5; i++) list.add(input.nextDouble());

        System.out.println("The sum of the 5 numbers = " + sum(list));

    }

    private static double sum(ArrayList<Double> list) {

        double sum = 0;
        for (double i : list) {
            sum += i;
        }
        return sum;
    }


}

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