Solution - Challenge For Xmen Battle Count

Tutorial Series: Free C# Fundamentals via ASP.NET Web Apps

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This is the solution for the challenge titled ChallengeForXmenBattleCount, dealing with arrays and using the for loop. This challenge isn't very complicated, but the details are tricky. Read on as much as you need in order to solve the problem facing you, then finish as much as you can on your own.

Step 1: Setting up your Project

In the CS-ASP_026-Challenge folder, navigate to the ChallengeForXmenBattleCount folder, then copy and paste it into your Visual Studio Projects directory.

Once this is done, open it and go to the Default.aspx.cs page. In the Page_Load, you'll find two starting arrays called names and numbers, as well as an empty string result. As described in the challenge document, the numbers and names in the arrays correspond to each other. So index 1 in both arrays would be "Iceman" in the names and 9 in the numbers array, meaning Iceman has fought 9 battles:


Step 2: Creating your for() Loop

Our task is to loop through these arrays and locate the X-Man with the most battles, and the X-Man with the least battles. In order to do this, we'll create a for loop like so:



Remember that you can either manually type this code, or you can create a "code snippet". To do this, type 'for' and press the Tab key twice to create a template that you can then edit.

This loop will continue to increment i until it it reaches the end of the names array, meaning that we will be able to evaluate every entry in it.

Step 3: Finding the X-Men in the Arrays

In order to keep track of the X-Men with the most and fewest battles, we'll create a few variables outside the scope of the loop:


The purpose of these variables will be to hold the value of the index that has the smallest and largest number, respectively. To do this, we'll create two if() statements within the loop:


These statements check to see if the value of numbers[i] (whatever index it is currently at) is smaller than numbers[smallestNumberIndex] (the current minimum value). If it is, then it replaces the current value of smallestNumberIndex with the value of i. This will continue to loop through every value of numbers, and will set the smallestNumberIndex variable to the index value with the minimum integer value; in this case numbers[6]. And, because the names and numbers are directly related, the same index will satisfy the requirement for the names index. The reverse is also true of the latter statement.


This method for evaluating the array is used because it logically makes the most sense to explain. If the current value is less than the previous lowest value, replace that value with the current value. However, you could also code it to evaluate if the current index is the minimum (or maximum) value in the array:


Step 4: Printing the Result

Now that we have found the index that houses the least and greatest value, we need to create a result to print out in the resultLabel. Per the requirements of the challenge, the result should look like:


We now know the index values for both arrays that will give us both the name and number, so we can use a String.Format() method to display the desired result:


This takes the values of the arrays at the index with the largest and smallest values, then assigns the names and numbers to their correct places. It is separated into two different methods for readability and simplicity's sake. If you wanted, it would be perfectly acceptable to type it like this:


Finally, set the resultLabel.Text equal to the result. Save and run your project to see the result:



This completes the ChallengeForXmenBattleCount solution. While this challenge didn't require much code to solve, it did take a lot of thinking and applying several concepts we've covered up to this point. Hopefully you were able to complete it on your own. If not, come back and try it again later. Do it differently, come up with your own solution or tailor it to your tastes. Keep trying until you understand the concepts, then move on and continue with the course. Great job!

Related Articles in this Tutorial:

Lesson 1 - Series Introduction

Lesson 2 - Installing Visual Studio 2015

Lesson 3 - Building Your First Web App

Lesson 4 - Understanding What You Just Did

Lesson 5 - Working with Projects in Visual Studio

Lesson 6 - Simple Web Page Formatting in Visual Studio

Challenge 1

Solution 1

Lesson 7 - Variables and Data Types

Lesson 8 - Data Type Conversion

Lesson 9 - Arithmetic Operators

Lesson 10 - C# Syntax Basics

Challenge 2 - ChallengeSimpleCalculator

Solution - ChallengeSimpleCalculator

Lesson 11 - Conditional If Statements

Lesson 12 - The Conditional Ternary Operator

Challenge 3 - ChallengeConditionalRadioButton

Solution - Challenge Conditional RadioButton

Lesson 13 - Comparison and Logical Operators

Lesson 13 Challenge - First Papa Bob's Website

Solution - Challenge First Papa Bob's Website

Lesson 14 - Working with Dates and Times

Lesson 15 - Working With Spans of Time

Lesson 16 - Working with the Calendar Server Control

Challenge 4 - Challenge Days Between Dates

Solution - Challenge Days Between Dates

Lesson 17 - Page_Load and Page.IsPostBack

Lesson 18 - Setting a Break Point and Debugging

Lesson 19 - Formatting Strings

Challenge 5 - Challenge Epic Spies Assignment

Solution - Challenge Epic Spies Assignment

Lesson 20 - Maintaining State with ViewState

Lesson 21 - Storing Values in Arrays

Lesson 22 - Understanding Multidimensional Arrays

Lesson 23 - Changing the Length of an Array

Challenge 6 - Challenge Epic Spies Asset Tracker

Solution - Challenge Epic Spies Asset Tracker

Lesson 24 - Understanding Variable Scope

Lesson 25 - Code Blocks and Nested If Statements

Lesson 26 - Looping with the For Iteration Statement

Challenge 7 - Challenge For Xmen Battle Count

Solution - Challenge For Xmen Battle Count

Lesson 27 - Looping with the while() & do...while() Iteration Statements

Lesson 28 - Creating and Calling Simple Helper Methods

Lesson 29 - Creating Methods with Input Parameters

Lesson 30 - Returning Values from Methods

Lesson 31 - Creating Overloaded Methods

Lesson 32 - Creating Optional Parameters

Lesson 33 - Creating Names Parameters

Lesson 34 - Creating Methods with Output Parameters

Challenge 8 - Challenge Postal Calculator Helper Methods

Solution - Challenge Postal Calculator Helper Methods

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Solution - Mega Challenge Casino

Lesson 35 - Manipulating Strings

Challenge 9 - Phun With Strings

Solution - Challenge Phun With Strings

Lesson 36 - Introduction to Classes and Objects

Challenge - Hero Monster Classes Part 1

Solution - Hero Monster Classes Part 1

Challenge - Hero Monster Classes Part 2

Solution - Challenge Hero Monster Classes Part 2

Lesson 37 - Creating Class Files Creating Cohesive Classes and Code Navigation

Lesson 38 - Understanding Object References and Object Lifetime

Lesson 39 - Understanding the .NET Framework and Compilation

Lesson 40 - Namespaces and Using Directives

Lesson 41 - Creating Class Libraries and Adding References to Assemblies

Lesson 42 - Accessibility Modifiers, Fields and Properties

Lesson 43 - Creating Constructor Methods

Lesson 44 - Naming Conventions for Identifiers

Lesson 45 - Static vs Instance Members

Challenge 10 - Challenge Simple Darts

Solution - Challenge Simple Darts

Lesson 46 - Working with the List Collection

Lesson 47 - Object Initializers

Lesson 48 - Collection Initializers

Lesson 49 - Working with the Dictionary Collection

Lesson 50 - Looping with the foreach Iteration Statement

Lesson 51 - Implicitly-Typed Variables with the var Keyword

Challenge 11 - Challenge Student Courses

Solution - Challenge Student Courses

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Lesson 52 - Creating GUIDs

Lesson 53 - Working with Enumerations

Lesson 54 - Understanding the switch() Statement

Lesson 55 - First Pass at the Separation of Concerns Principle

Lesson 56 - Understanding Exception Handling

Lesson 57 - Understanding Global Exception Handling

Lesson 58 - Understanding Custom Exceptions

Lesson 59 - Creating a Database in Visual Studio

Lesson 60 - Creating an Entity Data Model

Lesson 61 - Displaying the DbSet Result in an ASP.NET GridView

Lesson 62 - Implementing a Button Command in a GridView

Lesson 63 - Using a Tools-Centric Approach to Building a Database Application

Lesson 64 - Using a Maintenance-Driven Approach to Building a Database Application

Lesson 65 - Creating a New Instance of an Entity and Persisting it to the Database

Lesson 66 - Package Management with NuGet

Lesson 67 - NuGet No-Commit Workflow

Lesson 68 - Introduction the Twitter Bootstrap CSS Framework

Lesson 69 - Mapping Enum Types to Entity Properties in the Framework Designer

Lesson 70 - Deploying the App to Microsoft Azure Web Services Web Apps

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Papa Bob's Mega Solution Part 2 - Adding an Order to the Database

Papa Bob's Mega Solution Part 3 - Passing an Order from the Presentation Layer

Papa Bob's Mega Solution Part 4 - Creating the Order Form

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