Common Array Operations

Part of the Fundamentals section of Coddy's Java journey — lesson 66 of 73.

Here are some common array operations:

Find the sum of all elements in an array:

int[] numbers = {1, 2, 3, 4, 5};
int sum = 0;
for (int number : numbers) {
    sum += number;
}
System.out.println("Sum: " + sum);

Find the average of elements in an array:

int[] numbers = {1, 2, 3, 4, 5};
int sum = 0;
for (int number : numbers) {
    sum += number;
}
double average = (double) sum / numbers.length;
System.out.println("Average: " + average);

Find the maximum element in an array:

int[] numbers = {1, 5, 2, 9, 3};
int max = numbers[0];
for (int i = 1; i < numbers.length; i++) {
    if (numbers[i] > max) {
        max = numbers[i];
    }
}
System.out.println("Max: " + max);

Find the minimum element in an array:

int[] numbers = {1, 5, 2, 9, 3};
int min = numbers[0];
for (int i = 1; i < numbers.length; i++) {
    if (numbers[i] < min) {
        min = numbers[i];
    }
}
System.out.println("Min: " + min);

Challenge

Easy

Create a method named calculateStats that takes an array of integers as input and performs the following operations:

Calculates the sum of all elements in the array.
Calculates the average of the elements in the array.
Finds the maximum element in the array.
Finds the minimum element in the array.

The method should return an array of doubles containing the sum, average, maximum, and minimum, in that order.

Try it yourself

import java.util.Scanner;

public class Main {
    public static double[] calculateStats(int[] arr) {
        // Write your code here
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String text = scanner.nextLine();
        String[] arrString = text.split(",");
        int[] numbers = new int[arrString.length];
        for (int i = 0; i < arrString.length; i++) {
           numbers[i] = Integer.parseInt(arrString[i]);
        }
        double[] stats = calculateStats(numbers);
        System.out.println("Sum: " + stats[0]);
        System.out.println("Average: " + stats[1]);
        System.out.println("Maximum: " + stats[2]);
        System.out.println("Minimum: " + stats[3]);
    }
}