Introduction

The do-while and while statements provide control over code execution flow by repeating a block of code until a condition is satisfied.

Learning Objectives

• Utilize the do-while loop to iterate through a code block.

• Implement the while loop to iterate through a code block as well.

Prerequisites for Developers

• Familiarity with utilizing the if statement.

• Proficiency in using foreach and for iteration statements.

• Competence in writing Boolean expressions.

• Knowledge of generating random numbers using the System.Random class and the Random.Next() method.

Getting Started

What is the do-while loop?

The do-while statement runs a statement or block of statements as long as a specified Boolean expression remains true. As this expression is evaluated after each loop execution, a do-while loop executes at least once.

Example: do-while

Let’s create code that continuously generates random numbers ranging from 1 to 10 until we generate the number 7. The number 7 could be generated in one iteration or after several iterations.

To begin, create a static class file called “WhileLoop.cs” within the console application. Insert the provided code snippet into this file.

/// <summary> /// Outputs /// 2 /// 5 /// 8 /// 2 /// 7 /// </summary> public static void DoWhileLoopExample() {     Random random = new Random();     int current = 0;      do     {         current = random.Next(1, 11);         Console.WriteLine(current);     } while (current != 7); } 

Execute the code from the main method as follows

#region Day 5 - While & do-while  WhileLoop.DoWhileLoopExample();  #endregion 

Console Output

2 5 8 2 7 

Example: while

The while statement will iterate based on the Boolean expression. To do that add another method into the same static class as shown below

/// <summary> /// Outputs /// 9 /// 7 /// 5 /// Last number: 1 /// </summary> public static void WhileLoopExample() {     Random random = new Random();     int current = random.Next(1, 11);      while (current >= 3)     {         Console.WriteLine(current);         current = random.Next(1, 11);     }     Console.WriteLine($"Last number: {current}"); } 

Execute the code from the main method as follows

#region Day 5 - While & do-while  WhileLoop.WhileLoopExample();  #endregion 

Console Output

9 7 5 Last number: 1 

Continue statement with do-while

Sometimes, developers need to skip the rest of the code within a code block and move on to the next iteration. To achieve this add another method into the same static class as shown below

    /// <summary>     /// Outputs     /// 5     /// 1     /// 6     /// 7     /// </summary>     public static void ContinueDoWhileLoopExample()     {         Random random = new Random();         int current = random.Next(1, 11);          do         {             current = random.Next(1, 11);              if (current >= 8) continue;              Console.WriteLine(current);         } while (current != 7);     } 

Execute the code from the main method as follows

    #region Day 5 - While & do-while      WhileLoop.ContinueDoWhileLoopExample();      #endregion 

Console Output

    5     1     6     7 

Complete Code on GitHub

GitHub — ssukhpinder/30DayChallenge.Net

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