C # Introduction Part 1

1. C# Introduction Part 1

2. Which Visual Studio Should I use? • Any express (2010, 2012, 2013…) VS for Desktop • Any full version

3. Which Visual Studio Should I use? • Any Express (2010, 2012, 2013…) VS for Desktop • Any full version

4. .Net framework • Class Libraries …Console.ReadLine • MSIL • CLR

5. HelloWord, scope {}, method, Main, white space using System; usingSystem.Collections.Generic; usingSystem.Linq; usingSystem.Text; usingSystem.Threading.Tasks; namespace First { classProgram { staticvoid Main(string[] args) { Console.WriteLine("Hello World!"); Console.ReadLine(); } } }

6. IDE, Projects, solutions, debug and release mode, … C:\Users\<yourname>\Documents\Visual Studio 2012\Projects .sln(open using Notepad -> it is xml) Look at using .csproj

7. Debugging, Disable Squigglylines

8. C# .NET languages Compiling C/C++ old languages code.cs code.vb code.cpp C# compiler VB.NET compiler Intermediate Language (MSIL) + metadata Assembly language compiling Common Language Runtime (CLR) JIT compiler Machine language .exe Machine language .exe

9. Command Line compile and execution • C:\Windows\Microsoft.NET\Framework64\v4.0.30319 • csc.exe • cscProgram.cs

10. Comments, IntelliSense // . . . /* . . . */

11. Linenumbers (Tools->Options)

12. Data Types, variables x = 2 y = x + 1; Console.WriteLine(y) … 3 Need Variables

13. Data Types, variables cont

14. C# Variables Declaration and Naming

15. Primitives (though they are Objects)http://msdn.microsoft.com/en-us/library/ms228360(v=vs.90).aspx String object

16. NullableType (a bit advance)

17. King System.Object char int string

18. Primitives are Objects

19. isOperator* (will be later again) staticvoid Main(string[] args) { intmyInt = 5; TestIsOperator(myInt); stringmyString = "5"; TestIsOperator(myString); Console.ReadLine(); } privatestaticvoidTestIsOperator(Objectobj) { if (objisint) { inti = (int)obj; Console.WriteLine("Integer received"); } elseif (objisstring) { stringi = (string)obj; Console.WriteLine("String received"); } } }

20. All are objects

21. small integers (singed and unsinged)

22. big integers (singed and unsinged)

23. floatand double, decimal

24. Special Floating numbers (Division by 0)

25. Doubles vs Decimals

26. Ex: float and decimal* (again later) using System; usingSystem.Collections.Generic; usingSystem.Linq; usingSystem.Text; namespaceDoubleVsDecimal { classProgram { staticvoid Main(string[] args) { double a = 0.2f; double b = 1.0f; Console.WriteLine("{0}", a - b); decimal c = 0.2m; decimal d = 1.0m; Console.WriteLine("{0}", c - d); Console.ReadLine(); } } }output: -0.799999997019768 -0.8

27. Characters and Strings

28. Strings methods* (again later)

29. Immutable String * (again later)

30. StringBuilder* (again later)

31. Variable Scope *(again later) MyMethod

32. Type Conversion (cast)

33. Back to our example: using integer data type int x = 2; int y = x + 1; Console.WriteLine(y);

34. Case sensitive language stringmyName; myName= "Andrew"; Console.WriteLine(myName); stringmyname = "Alice"; Console.WriteLine(myname); one line

35. Introducing var • Don’t be afraid varmyName1 = "Bill";

36. Conversion again* (again later). C# is a Strongly Typed Language string s = "Angie"; inttimes = 100; Console.WriteLine(times + s); string ok = times + s; intbad = times + s;