While Loop

Part of the Fundamentals section of Coddy's C# journey — lesson 42 of 69.

A while loop is different from the for loop. A for loop allows us to iterate over a specific range, whereas a while loop allows us to keep iterating as long as a certain condition is met.

To use a while loop write:

while (condition) {
	code
}

The code will execute only if the condition is true.

There are many use cases where a while would solve the problem, but the for loop would not.

Challenge

Beginner

Write a program that gets one input, double number.

Use a while loop to repeatedly divide the number by 2, and keep dividing as long as the current value is bigger or equal to 3.5.

Print the first number that is smaller than 3.5.

Cheat sheet

A while loop executes code as long as a condition is true:

while (condition) {
	code
}

Unlike for loops that iterate over a specific range, while loops continue based on a condition being met.

Try it yourself

using System;

public class Program {
    public static void Main(string[] args) {
        // 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 Loop Foreach 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 LoopWhile LoopDo While Loop Break Continue Nested Loop Infinite Loop Recap - Dynamic Input

12String Operations

String Methods Part 1 String Methods Part 2 String Formatting