Introduction - C Sharp Programming - Lecture Slides, Slides of C programming

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Introduction

01_intro.ppt

Introduction to C#

• Programming
• C# History (brief)
• Compiling Process
• Categories of Programming Errors

Programming Categories

• Object-Oriented Programming (OOP)
  • Emphasis is on identifying objects in a problem (student, faculty, etc).
  • Objects are then categorized into classes (person).
  • Classes are used in programs to create and manipulate objects. objCustomer = new clsCustomer;
• Procedural Programming
  • Emphasis is on identifying the procedures or steps to solve a problem and then creating a program as the solution.
• Event Programming
  • Usually related to GUI programming.
  • Program reacts to events, such as a user clicking on a mouse.
• All of these techniques will be used throughout our C#.NET assignments.

History of C#

• In 2000 Microsoft released the .Net programming platform.
• Microsoft included it’s new language C# (pronounced C-Sharp).
• Roots are in C, C++, and Java.
• .Net includes a rich library of pre-built components that are shared among the .Net languages such as Visual Basic (VB).
• If you know VB, you should recognize some of the classes and methods that are used in C#.

C# Form

C# Methods

C# to Machine Language

• C# programs are typed in as text.
• Programs have a .cs extension.
  • CS1Form.cs
• Form Resources have a .resx extension.
  • CS1Form.resx
• Must be converted to machine language.
• How?
• By compiling…

Compiler and Linker

• Compiler
  • Verifies the program is coded with commands it recognizes and that the proper syntax was used.
  • Creates an object file (machine language).
• Linker
  • Combines the program’s object file with object code of standard routines from the library.
  • Creates the final executable file (.exe).
  • In the .Net Framework, Common Language Runtime (CLR) is the linker.

Syntax

• There are several languages to choose from.
• Each language has a set of commands that can

be used.

• Each language has a set of syntax rules that

must be followed.

• Syntax determines many things - like how commands are entered and how each command should end (period, semi-colon, etc).

Three Categories of Errors

• Syntax Errors and Warnings
• Logic Errors
• Run-time Errors
  • Actually are logic errors.

Logic Errors

• Detected and corrected by programmer.
• Program designed or written incorrectly.
• Output generated does NOT match expected

output.

• Simple to very complex.
  • Using * (multiply) instead of + (add)
• Test, test, test and verify results.
• This is where programmers earn their money.

Run-time Errors

• Usually discovered by user, but corrected by programmer.
• Program terminates unexpectedly.
  • Error: access violation …
• Usually based on a logic error.
  • Divide by zero
• Users do something programmer didn’t expect them to do. - Processing unexpected input, such as letters instead of numbers.
• Users need to document what they were doing when the error occurred to help programmer.