Coding 101

Feb 20th 2014

Coding 101 5

Somewhat Function(al)

This week we are reviewing If (then) Else Statements and Functions.
Records live every Monday at 5:30pm Eastern / 2:30pm Pacific / 22:30 UTC.
Guests: Louis Maresca
Category: Help & How To

Welcome to Coding 101 - It's the TWiT show that gives YOU the knowledge to live in the wonderful world of the programmer. This week we are reviewing If (then) Else Statements and Functions.

Reviewing If Else and Viewer Submissions

* Check out Ep 2 and 3 for how to download the IDE for Windows and Mac. * Opening simple projects in Visual Studio Desktop: I was wondering why my project files weren't working correctly when I just chose to "Open File". Turns out, every time you open a new file in Visual Studio, it has to be tied to some project. So I was able to Open Project and choose the specific file that I wanted to play with. Since my Project will always try to build the file from first opened to last, I would end up having to attach two files together. I'm not quite at that experience level, so I'm attaching each new file to a new project. * My example is similar to Lou's but I decided to play around with the color and the output from the console app. Mine takes user input and asks what the air speed velocity of a swallow is. If the text they type in is not an integer, it errors out. If it is, it asks them to print it on separate lines or all together. Then, it exits. * "Relational Operators" - Code elements that let you compare two operators against a relationship.Those relational operators are: "<" - Less Than ">" - Greater Than ">=" - Greater Than or Equal to "<=" - Less that or Equal To "==" - Equal To "!=" - Not Equal To Viewer Submissions! From Matt and Joshua: My 8 year old son, Joshua, is really enjoying your Coding 101 show and he wanted to try writing a Tic Tac Toe game. He and I have spent the past couple of days coding and debugging a simple console based Tic Tac Toe game in C#. He also wanted to send you the code to look at and try. It is a very simple 2 player tic tac toe game with no AI, but it was a lot of fun to do. Thank you for doing this show. Code is available in our GitHub Repository. From SquareIguana: First example. A simple Example Using Coding 101 - C# - Episode 01 - Variables And Console. I think we can do better than to show the boring old black console window, there are even sounds that can be described as musical notes in the example. And the code is available here. Second example. A simple Example Using Coding 101 - C# - Episode 02 - While Loops The first thing I think when talking about while loops is animations and games. And for games we need at least some ifs... so animation its a cool demonstration for this example. Code is available here. Find the Code for ALL of our episodes HERE!

Ivory Tower

A Function is a code element that allows you to encapsulate a piece of code that can be then "called" by other parts of your program. Functions are VERY useful anytime you have piece of code that needs to be repeated or called at multiple times in the execution of your code.

Defining a Function

Functions in C# are definted in the following manner: () { } Access Level: Functions can be public or private and a few other types that determine what can "see" the function Return: The type of data that the function will return. If the function doesn't return any data, simply use "void" (also, "int" "string" etc) Method Name: The name of the function, this is the name that will be used when the function is called Method Parameters: This is the data that the function RECIEVES for use in it's encapsulated code.


public int answer(int a, int b) { int c = a + b; return c; }

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