test 2 Flashcards
for each loop array
static void Main( )
{
int[] fibarray = new int[] { 0, 1, 2, 3, 5, 8, 13 };
foreach (int i in fibarray)
{
Console.WriteLine(i);
}
}
class
a program construct used to represent an entity type in the real world… used as a templit to create objects… classes contain both data and procedural information
object
an instance of a class… reps a real-world occurrence of an entity
attribute
characteristic of a class. In-line attributes are ones that are declared within the class Associated attributes are contained in another class.
Method
procedure that applies to the data in a class.
Inheritance
a class association that allows the attributes and methods of a parent class to be available to the child classes.
class visibility modifiers
Public (+)
Protected (#)
Package (~)
Private (-)
static
means that the class component is
associated with the classUML Class Diagrams
Class name – Starts with capital, camel case thereafter.
Attributes – Characteristics of the class (i.e., variables and constants).
Methods – Behaviors of the class (i.e., procedures).
Inheritance links – Associations between classes
CASE Selection Structure
SELECT CASE light-color CASE “red” Print “stop light” CASE “yellow” Print “caution light” CASE “green” Print “go light” CASE Else Print “broken light” ENDSELECT
Iteration Constructs
DO WHILE - Test at top, 0 or more loops
DO UNTIL - Test at bottom, 1 or more loops
Access Modifiers
Protected
Internal
Protected Internal
Public
single dimension array
decimal[] money = new decimal[100];
rectangular 2-D
type[ , ] identifier = new type [intValue, intValue];
jagged 2-D
type[][] identifier = new type [intValue] [];
Enumerations
a convenient way to create a set of symbolic names that map to known numeric values.
enum StudentType
{
Freshman, //=0
Sophomore, //=1
Junior, //=2
Senior //=3
}
using enum.
StudentType.Freshmanstructs
are data structures composed of several pieces of data.
public struct Product
{
public string Code;
public string Description;
public decimal Price;
}sealed vs abstract
abstract–cannot be instantiated, only derived from.
sealed–cannot be derived from, only instantiated.
encapsulation
classes and objects can hide information from the outside world
Polymorphism
The fact that child classes can override the methods and attributes of the super class
data members
store data associated with the class or instance of the class.
Function members
execute code and model the actions of the real-world object that the class represents.
creating objects
Car myCar= new Car();
adding field values to an object
ObjName.fieldName = “value”
custom constructor
public ObjName(int myInt)
{
Console.WriteLine(“Custom code here”);
}override methods
takes an existing inherited method and provides a new implementation of that method.
hiding methods
classes or structs redeclare names that were inherited from base classes
TryParse
is used to convert text data to numeric without causing a run-time exception
int.TryParse(input, out val);
try-catch-finally
try{ // Statement(s) which can cause an exception
}catch(type x){ // Statement(s) for handling the exception}
finally{ // Cleanup code (if needed)}
params
create a parameter array which allows you to pass an indefinite number of arguments.
out
requires the called function to give the parameter a value. Allows functions to pass data back to calling routine.
ref
value is initially assigned by the calling routine, but may be changed within the function. Allows values to be passed back
