Lære Loops and Arrays | Applying Loops in Real Problems

A Powerful Combination

Arrays let you store a collection of values in a single variable, making it easy to manage lists of data such as scores, names, or sensor readings. When you need to process every value in an array—like summing numbers or searching for a match—loops become essential. Instead of writing repetitive code for each element, you can use a loop to automate the task, saving time and reducing errors.

Using loops with arrays helps you handle large datasets efficiently and write cleaner, more flexible code.

Practical Example – Iterating an Array

You often need to process every item in a list, such as finding the total of expenses or displaying all entries in a contact list. In these cases, you iterate through an array to perform an action with each element.

Task:

Imagine you have an array of daily sales amounts for a week;
Your goal is to calculate the total sales for the week by iterating over the array and summing each value;
Print the total sales amount to the console.

Main.java


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package com.example;

public class Main {
    public static void main(String[] args) {
        // Array of daily sales for a week
        int[] dailySales = {120, 150, 100, 170, 200, 130, 180};

        int totalSales = 0;

        // Loop through the array to calculate total sales
        for (int i = 0; i < dailySales.length; i++) {
            totalSales += dailySales[i];
        }

        System.out.println("Total sales for the week: " + totalSales);
    }
}

We create an array dailySales that stores the sales for each day of the week;
We initialize a variable totalSales to 0 to keep track of the sum;
We use a for loop to iterate over each element of the array:
- The loop index i starts at 0 and goes up to dailySales.length;
- At each iteration, we add dailySales[i] to totalSales.
After the loop finishes, we print the total sales for the week using System.out.println.

Arrays allow you to store multiple values of the same type in a single variable. Loops make it easy to iterate over these arrays to read or modify elements efficiently. By combining loops with arrays, you can perform tasks like calculating totals or updating values without writing repetitive code.

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