CIS 199 Test 01 Review

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CIS 199 Test 01 Review
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Computer Hardware

• Central Processing Unit (CPU)
• Brains
• Operations performed here
• Main Memory (RAM)
• Scratchpad
• Work area for programs, process, temporary data
• Secondary Storage
• Hard drive
• Flash drive
• CD, DVD

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Input, Output Devices

• Input
• Takes data IN
• Keyboard, Mouse, Game Controller, Microphone
• Output
• Pushes, places data OUT
• Display, Speakers, Printers

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Programs and Digital Data

• Programs
• Operating Systems. Microsoft Office, Web browsers
• Instructions read by CPU and processed
• Digital Data
• 1s
• 0s
• forms binary (base 2)

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Built-In Types
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Properties

• Exposed Variables or accessible values of an
  object
• Can have access controlled via scope modifiers
• When thinking of properties Values and
  definitions
• get Code to run before returning a value
• set Code to run before updating a value
• Can be used for validation and other processing
  actions
• value is a keyword in set

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Methods

• Actions, code to be executed
• May return a value, may take value (not required)
• Can be controlled via scope keywords
• Can be static

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Scope

• private Can only be accessed by the class,
  object itself
• protected Can only be accessed by the class,
  object, or any child classes, objects
• public Available access for all

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Named Constants

• AVOID MAGIC NUMBERS!
• Allows for reference across similar scope
• Change once, changes everywhere

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Conditional Logic

• if(expression)
• If expression is true
• If not true, skipped
• else if(expression)
• Can be used to chain conditions
• Code runs if expression is true
• else
• Code to execute if expression false
• Statements can be nested

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Relational Operators

• gtGreater than
• ltLess than
• gtGreater than OR equal to
• ltLess than OR equal to
• Equal to
• !NOT equal to

• X gt Y
• X gt Y
• X lt Y
• X lt Y
• X Y
• X ! Y

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Operator Precedence

• (Highest)
• , --, !
• /
• -
• lt gt lt gt
• !
• / -
• (Lowest)

• Detailed fromhttp//msdn.microsoft.com/en-us/lib
  rary/2bxt6kc428vvs.10029.aspx

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Comparing Strings

• You can use
• , !
• You cannot use
• gt, gt, lt, lt

• You SHOULD use
• String.Compare(s1, s2)
• s1 gt s2
• Returns positive Number
• s1 s2
• Returns zero
• s1 lt s2
• Returns negative number
• Compares the unicode value of EACH character

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Exceptions andException Handling

• Exceptions are
• Exceptional events
• Unexpected events, errors during runtime
• Unhandled exceptions? Stack trace and application
  death
• Handled with try/catch/finally blocks
• Try block attempts to run the code in question
• Catch block handles the exception(s) that may
  occur
• Finally block, optional, always executes

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Sample Questions fromBlackboard Wiki
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What does WYSIWYG stand for?

• What
• You
• See
• Is
• What
• You
• Get

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GroupBox Vs Panel

• GroupBoxes have
• Group Title

• Panels have
• Scroll bar
• Border styling options

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What is the difference between a high-level and a
low-level language?

• Low-Level
• Little to no abstraction from the hardware or
  computer
• Close to the hardware
• Simple, but Difficult to use
• Machine code, assembly, C (in some cases)
• High-Level
• Very strong abstraction from the hardware or
  computer
• Far from the hardware
• Easier to use, abstraction adds complexity
• C, Java, C, Python

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How is the lifetime of a FIELD different from a
lifetime of LOCAL variable?

• Fields are members of their containing type
• Fields can be used everywhere with appropriate
  scope
• Local variables can be used only in their local
  environment

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What two things does a variable declaration
specify about a variable?

• Type
• Identifier

TYPE
IDENTIFIER
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Describe and and how they work.

• (AND)
• Returns true if conditions are ALL true
• If you do well on the test AND the quiz, you
  will earn a great grade!
• (OR)
• Returns true if ANY conditions are true
• You can run a mile OR walk two miles (possible
  do both!)

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Why is TryParse more effective than Parse?

• Less code
• No try / catch required

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What is the difference between a SIGNED an
UNSIGNED int?
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What is the difference between syntax errors and
logic errors?

• Syntax Errors Errors that prevent compilation
  or other factors that prevent successful
  compilation
• striing myString string.Empty // Wont
  compile, syntax error
• Logic Errors Errors that occur during runtime,
  such as incorrect comparison or other unexpected
  behavior
• If(grade gt 60) Code if grade is F //
  Incorrect operator used

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What are the Five logical units?

• CPU Processing, instructions
• Memory Scratch pad, working space (Temporary)
• Secondary Storage Hard drives, storage (Long
  term)
• Input Keyboards, Mice, Controllers
• Output Monitors, Speakers, Printers

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Explicit type conversion? Why and how?

• Variables must be used for a single type never
  change
• Move from one type to another, must cast
• EXPLICIT cast / type conversion
• Aware of information loss

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Write a code fragment that will display Good
Job when int variable score is 80 or more, OK
when score is 70 79, and Needs Work for any
score under 70.
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Write a code fragment that will apply a 10
discount to the value in double variable total
when int variable numItems is 5 or more and int
variable zone is 1, 3 or 5.
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Class Vs Objects

• A Class can be described as a logical collection
  of attributes and behaviors (methods) that
  describe how a group of objects look and
  behave.
• An object is an instance of a class.
• Classes can be viewed as templates from which
  objects are created e.g. building plan (class) ?
  houses (object)
• The objects from a class can share the same
  features and structures but can differ in
  implementation and use e.g. Car (Class) ? RedCar
  (object 1), BlueCar (object 2), SilverFastCar
  (object 3), SilverSlowCar (object 4)

class
Car RedCar new Car(Red, 90.0) //object
1 Car BlueCar new Car(Blue, 90.0) //object
2 Car SilverFastCar new Car(Silver, 100.0)
//object 3 Car SilverSlowCar new Car(Silver,
20.0) //object 4
Car Color MaxSpeed Accelerates()
Attributes
method
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Question?

• ANSWER

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