Using For Loop

Part of the Fundamentals section of Coddy's C# journey — lesson 64 of 69.

Iteration means going through elements one by one in a sequence. With arrays, we can access each element systematically using different methods.

The most common way to iterate through an array is using a for loop:

string[] fruits = {"apple", "banana", "orange"};
	for (int i = 0; i < fruits.Length; i++) {    
	Console.WriteLine(fruits[i]);
}

Output:

apple
banana
orange

Challenge

Easy

Create a program that starts with an array of words, and prints a new array containing only the words longer than 5 characters

Reminder: to print an array use the Join() function: Console.WriteLine(string.Join(", ", arr));

Cheat sheet

To iterate through an array, use a for loop:

string[] fruits = {"apple", "banana", "orange"};
for (int i = 0; i < fruits.Length; i++) {    
    Console.WriteLine(fruits[i]);
}

To print an array, use string.Join():

Console.WriteLine(string.Join(", ", arr));

Try it yourself

using System;

public class Program {
    public static void Main(string[] args) {
        string text = Console.ReadLine();
        string[] arr = text.Split(',');
        // Write your code below
    }
}

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

1Introduction

C#Hello World!Comments Basic Program Structure

4Operators Part 1

Arithmetic Operators Modulo Operator Increment/Decrement Post Increment/Decrement Arithmetic Shortcuts

7Basic IO

Basic Output String Interpolation Reading Input Parse Recap - Till 120 Recap - True or False

10Methods (Functions)

Declaring Methods Method Parameters Return Types Optional Parameters Recap - Validation Function Void Methods

13Iterating Over Collections

Using For LoopForeach Loop Common Array Operations

2Variables Part 1

Numbers Char String Boolean Type Declaration

5Operators Part 2

Comparison Operators Logical Operators Part 1 Logical Operators Part 2 Recap - Simple Logic Logical Operators Part 3

8Calculator App

Welcome Message Getting Numbers

Basic Operations

Formatted Output

11Arrays Basics

Declaring Arrays Accessing Elements Modifying Arrays Array Methods Recap - Product Array Edit Recap - Reversed Array

14Final Challenges

Number Pattern Pattern Finder Student Grade Calculator

3Variables Part 2

Var Constants Naming Conventions Recap - Initialize Variables Type Casting

6Decision Making

If Statement If - Else Switch Statement Ternary Operator Recap - If Else Nested If - Else

9Loops

For Loop While Loop Do While Loop Break Continue Nested Loop Infinite Loop Recap - Dynamic Input

12String Operations

String Methods Part 1 String Methods Part 2 String Formatting