Posts tagged ‘C#’

Highest Demand Programming Languages in March 2015

ProgrammingLanguageListingsOnDiceA question that I hear frequently is: “Which programming language (or languages) should I learn? Usually the person asking is a student and what they really mean is, “What programming language will get me a job?!” My usual answer is that it’s more important to focus on learning concepts (like: inheritance, composition, polymorphism, data structures, design patterns, etc.) because these are pretty much the same regardless of language. If you learn C# in-depth, and then get a job where you need to use Java, you should be able to apply the concepts you know (and even a lot of the syntax) and pick up Java quickly. But, of course, you would still want to choose a language that is at least in the top dozen, as far as job demand. (more…)

March 27, 2015 at 3:11 pm 3 comments

C# Pass-by-reference – Concept and example

670px-Pass-a-Soccer-Ball-Step-3-Version-2One of the concepts that many of my beginning programming students find difficult to wrap their heads around is the different ways that arguments can be passed when a method is called.  The two mechanisms for passing an argument to a method are pass-by-value and pass-by-reference.

(No, this post isn’t about soccer, I just wanted to get you thinking about passing.)

Advice to new programmers: Skip this paragraph. But the rest of this post is for you!
Before launching into our discussion, I need to clarify that we’re only talking about what happens when we pass value types to method parameters. Value types are the types enum and struct. The numeric types and bool type that are built into C# are all actually structs and so they are all value types. Interestingly, strings are not value types, they are reference types, but that’s a topic for another post!

I should make another clarification too. When I talk about the code that calls a method, I refer to the variables passed to the method as arguments, but when I talk about the code that defines a method, I call the variables inside the parenthesis parameters.

Pass by Value
Let’s take a look at a “normal” C# method definition:

     int Sum(int num1, int num2)    // this method returns the sum of num1 and num2
     {
          return num1 + num2;
     }

(more…)

March 15, 2015 at 5:20 pm Leave a comment

Happy Pi Day!

It’s Pi day and it’s a once-every-hundred-years Pi day! It’s a spceial Pi day since the year ends in 15. So the date: 3-14-15, matches the number Pi to four decimal places: 3.1415.

Kash Farooq has provided a nice set blog posts showing different methods for calculating Pi using C#. Here they are:

Calculating Pi in C# part 1 – using series algorithms

Calculating Pi in C# part 2 – using the .NET BigInteger class

Calculating Pi in C# part 3 – using the BigRational class.

March 14, 2015 at 9:45 am Leave a comment

Resources for Learning C# and .NET

CSharpLogoI compiled this list of resources for students in my Xamarin Android and iOS app development courses. These are the best resources I have found for learning C#. They are categorized for new programmers and for programmers who already know another language. If you have found some other great resources, tell everyone about them in a comment!
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September 27, 2014 at 4:54 pm Leave a comment

Xamarin Android course

Xamarin Certified

Certified in 2014

Free Guest Access!
I’ve added free guest access to the first two weeks of my course here: CS235AM Moodle Course. You can log in using the “Guest” button without being enrolled as a student at the college. If you like what you see, you can enroll as a student at Lane Community College, then contact me so I can clear you to register for CRN 33368. The class starts January 8, 2018, but you can register later after cheking out the first week or two.

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September 9, 2014 at 8:39 pm 1 comment

How to compile AMCap

The DirectShow SDK (now part of the Windows SDK) includes a sample application called AMCap (Active Movie Capture) that illustrates the use of DirectShow filters to capture video from a device like a webcam or camcorder. I had all kinds of trouble the first few times I tried to build this, so I documented the steps for a successful build. Here they are:

These are the steps I followed to successfully build and run AMCap. I used Visual Studio 2005 Professional edition, SP1 for Vista, running on Windows Vista Business version . Note: the paths I have listed are the default installation paths and may be different on your computer.

(more…)

July 20, 2007 at 8:53 am 10 comments

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