Oppiskele Iterating Over Arrays | Array Fundamentals

Working with arrays often means you need to process or examine each element in the array. Instead of writing out a separate statement for every element, you can use loops to repeat actions for each item. This process is called iteration, and it is essential for handling arrays of any size efficiently. Loops let you quickly perform actions like printing, updating, or searching through all the elements in an array, making your code both shorter and easier to manage.

Program.cs


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using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main()
        {
            int[] numbers = { 5, 10, 15, 20, 25 };

            for (int i = 0; i < numbers.Length; i++)
            {
                Console.WriteLine(numbers[i]);
            }
        }
    }
}

The for loop is a powerful tool for iterating over arrays. Its structure consists of three main parts: an initializer (usually setting up a counter variable), a condition (which determines when the loop should stop), and an increment (which updates the counter each time). When working with arrays, the counter variable acts as the index, starting from 0 (the first element) and continuing until it reaches array.Length - 1 (the last valid index). Using array.Length as the upper bound ensures you visit every element without going out of range.

Program.cs


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using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main()
        {
            string[] fruits = { "Apple", "Banana", "Cherry" };

            foreach (string fruit in fruits)
            {
                Console.WriteLine(fruit);
            }
        }
    }
}

Definition

A foreach loop is a loop that automatically iterates over each element in a collection, such as an array, without needing to use indices. It is especially useful when you want to process every item in order and do not need to know their positions.

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Osio 1. Luku 5

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Suggested prompts:

Can you show me an example of a for loop iterating over an array?

What are some common mistakes to avoid when using loops with arrays?

How does iteration differ between different programming languages?

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Program.cs


              123456789101112131415161718
            
using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main()
        {
            int[] numbers = { 5, 10, 15, 20, 25 };

            for (int i = 0; i < numbers.Length; i++)
            {
                Console.WriteLine(numbers[i]);
            }
        }
    }
}

Program.cs


              123456789101112131415161718
            
using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main()
        {
            string[] fruits = { "Apple", "Banana", "Cherry" };

            foreach (string fruit in fruits)
            {
                Console.WriteLine(fruit);
            }
        }
    }
}

Definition

Oliko kaikki selvää?

Kiitos palautteestasi!

Osio 1. Luku 5

Iterating Over Arrays

1. What is the main difference between a for loop and a foreach loop when iterating over arrays?

2. Which loop type is best when you need to modify elements by their index?

3. What happens if you use array.Length as the upper bound in a for loop?

Iterating Over Arrays

1. What is the main difference between a for loop and a foreach loop when iterating over arrays?

2. Which loop type is best when you need to modify elements by their index?

3. What happens if you use array.Length as the upper bound in a for loop?