Post on 01-Apr-2015
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Images from Africa
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My little Haitian friend Antoine (1985)
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Overview
Variables & ExpressionsBasic C# SyntaxCommentsDeclaring & initializing variables
Flow controlBoolean logicBranching & looping
Advanced typesenum, struct, Array
Type conversionsFunctionsVariable scope
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Basic C# Syntax
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Comments
//, ///, /* */
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Declaring & Initializing variables
<type> <name>;<name> = <initial_value>;
OR<type> <name> = <initial_value>;
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Types – esp. Value
Apart from bool, char,& enum, value types havea range of numbers theysupport (p. 37)
Type Range
byte 0 to 255
sbyte -128 to 127
short -32768 to 32767
int -2147483648 to2147483647
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For real numbers …
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Most commonly used types
int
string
double
bool
char
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Variable names & initial values
<type> <name> = <initial_value>;
Variable namesCannot
Be a C# keywordBegin with a number or special char except _ and @Contain chars like -, ‘, etc)
ShouldBe camelCaseDescribe the content
Initial values0 for numbers or what makes sense for appstring.Empty / “” for strings, etc.
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Expressions
<variable> = <operand> <operator> <operand>
// x = x + 1, z = x + 1// x = x + 1, z = x// x = x - 1, z = x – 1// x = x - 1, z = x
p. 46, 47 in Watson et al.++x add before expression evaluatedx++ add after expression evaluated
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Overview
Variables & ExpressionsBasic C# SyntaxCommentsDeclaring & initializing variables
Flow controlBoolean logicBranching & looping
Advanced typesenum, struct, Array
Type conversionsFunctionsVariable scope
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Boolean Logic
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Branching with if
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Branching with switch
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Looping with for
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Looping with while
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Looping with do
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Interrupting loops
breakExit from loop
continueReturn to top of loop
returnExit from loop & containing function
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Overview
Variables & ExpressionsBasic C# SyntaxCommentsDeclaring & initializing variables
Flow controlBoolean logicBranching & looping
Advanced typesenum, struct, Array
Type conversionsFunctionsVariable scope
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Advanced types – enum
To constrain the possible values for a variableDeclared at same level as classPlain text names associated with number
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Advanced types – struct
A custom, multi-valued, type that can have functions
Declared at same level as classCan contain value types (int, long, double, etc) and strings
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Advanced types – Array
Making it easier to create/access groups of values of the same type
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Overview
Variables & ExpressionsBasic C# SyntaxCommentsDeclaring & initializing variables
Flow controlBoolean logicBranching & looping
Advanced typesenum, struct, Array
Type conversionsFunctionsVariable scope
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Type conversions
Types with smaller range can be implicitly converted to types with larger rangeOther types MAY be explicitly converted target_type outvar = (target_type) variableName
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Functions: Defining and calling
Syntax for defining functions: [scope] [static] return_type name ([params]){ // C# statements [return [return_value]];}
0 or more params are declared like variables and comma separated.
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Params by ref and by value
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Variable Scope
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Funny if it wasn’t true
Air Transat ad
My version