CH1 – A 1st Program Using C#

Visual C#

ProgramSet of instructions which tell a computer what to

do.Machine Language

Basic language computers use to control its switches

0 = switch is off1 = switch is on

High-Level Programming LanguageUses ‘reasonable’ words as instructions

SyntaxLanguage rules

Programming Vocabulary

CompilerTranslates high-level language

into machine codeSyntax-error

Incorrect use of programming languageLogic

Instructions in the correct order to produce the desired results

DebuggingCorrecting syntax and logic errors

Programming Vocabulary

Turn to page 39 and answerReview Questions 1 – 3.

Questions and Problems

Object-Oriented Programming (OOP)an approach to designing modular, reusable software systems

VariableComputer memory storage location

IdentifierVariable name

ObjectContains its own variables, methodsSimilar to real-world objects (green racing car)

Object-Oriented Programming Vocabulary

AttributesObjects characteristics

StatesValue of an attribute

ClassCategory of objects

InstanceAn individual member of an object

Methoda collection of statements grouped together to perform an

operation.

Add a to b = c

Object-Oriented Programming Vocabulary

Racing

AutomobileGreen racing

car

Class (Automobiles)(attributes,methods)

Object(year, make, model, color)

(attributes, methods, variables)

Instance(Green racing car)

Instance(Blue suburban)

Object-Oriented Programming Vocabulary

EncapsulationPackaging an object’s attributes

and methods into an undivided entity.Polymorphism

Creates methods which act appropriately depending on the context.

InheritanceThe ability to extend a class so as to create a

more specific class.

Object-Oriented Programming Vocabulary

Filling your dog v. filling your car

Automobile v. RacingCars

Turn to page 39 and answerReview Questions 4 - 7.

Questions and Problems

C# - object-oriented and component-oriented language.

Literal StringA series of characters which will be used

exactly as enteredEnclosed within double quotation marks “ “Label the literal string on the diagram

Argument Info a method needs to perform its task.Enclosed within double parentheses ( )Label the argument on the diagram

Writing a C# Program Vocabulary

“Hello, world!”

(“Hello, world!”)

WriteLine () – a method which displays output and positions the cursor on the next line.Label the method on the diagram

NamespaceA way to group similar classes.System namespace = holds commonly used classesLabel the namespace on the diagram

Label the Main method on the diagramMethod Header

Method name Info about what will pass into and be returned from the

method.Label the method header on the diagram

Writing a C# Program Vocabulary

Method Body All the instructions executed by the method. Enclosed between double {}Label the method body on the diagram

WhitespaceBlank linesLabel one example of whitespace on the diagram

KeywordPredefined/reserved identifier which has special

meaning to the compiler.Static – method executed through a class, not by an

objectVoid – method does not return any valueUse Table 1-1 on page 13 to label the keyword(s) on the

diagram

Writing a C# Program Vocabulary

Access ModifierDefines the circumstances about when the method

may be used.Private – other classes may not use the methodPublic – other classes may use the methodLabel the access modifier(s) body on the

diagramSource Code

The text of the program you write

Writing a C# Program Vocabulary

Turn to page 40 and answerReview Questions 9 – 14 and

17.NEXT

Turn to page 41 and answerExercises 2 and 3.

Questions and Problems

Identifiers MUSTBegin with an underscore, @, or a letterContains only letters or digitsCannot be a C# reserved keyword

Programming Standard (see page 14 Table 1-2)Begin with uppercase letterUse uppercase letters to improve readability

Selecting Identifiers

Turn to page 40 and answerReview Questions 15 - 16.

NEXTTurn to page 41 and answer

Exercise #1.

Questions and Problems

Line CommentsBegin with two forward slashes //

Block CommentsBegin with a forward slash and an asterisk /*End with and asterisk and a forward slash */Write comments on the diagram stating

something the program is doing

Adding Comments

; ‘period’ at the end of each line

. Separate the names of namespace, class, object, method

Additional Syntax

1. Open Microsoft Visual C# 20102 Express2. Click File, New, Project3. Click Console Application4. Type the name of the project in the Name bar

HelloWorld5. Browse to your W: drive in the Location bar6. Create a C# folder W:\IntroPgming\C#\7. Make sure the location bar has your W: drive and folder

name!!!8. Click OK.9. Turn to page 30 and enter the code in figure 1-19.

(some is already there)Type at least one comment.

10. Click Save.11. Click Build, Build Solution12. Click Debug, Start with Debut if there are errors13. Click Debug, Start without Debug if there are no errors

1st C# Program

Turn to page 42.Complete exercises 4, 5, 7, 8.

Include comments in all programs.

NEXTTurn to page 43.

Complete the four Debug exercises.

Programming