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Method Body- Statements
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Date created
Mar 1, 2020
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Section 1
(50 cards)
Method Body- Statements
Enclosed in curly braces includes program statements calls to other methods e.g Main calls WRITELINE AND READKEY
Assignment Statements
assignment statement takes the form of variable = expression.
Application Software
Performs a specific task. EG. word processors, spreadsheets etc
Escape Sequence Characters
\t
Type
Classes are used to define types.
Polymorphism
Methods of parent and subclasses can have the same name, but offer different functionality.
Variables
Area in computer memory where a value of a particular data type can be stored -declare a variable - allocate memory
object
instance of a class.or an example of that class
Namespaces
provide scope for the names defined within a group. each user defined namespace body is then enclosed in curly brace.
Access Modifiers
public - no restrictions protected- limited to the containing class or classes derived from the containing class internal - limited to current project protected internal - limited to current project or classes derived from class private- limit to containing class
.NET
Not an operating system, resides at a layer between operating system and other applications.
Pseudocode
Algorithim written in near english statements for pseudocode
Comments
Green.// multiline : / and end /
Encapsulation
Combine attributes and behaviours to form a class
Methods
defined inside classes. group program statements. All programs consist of at least one method.
FLOWCHART
OVAL- beginning and end Rectangular- processes Diamond - decision to be made Parallelogram - input and output Flow Line
Method
[modifier] returnType MethodName (parameterlist)
Format Output
Add Dollar signs,percent symbols or commas to serperate digits
Escape Sequence Characters
\t
\*
\'
\"
\\
\r- cursor advances to the beginning
\b - cursor advances back one position(backspace)
\a - alert signal is sounded
Modifiers
indicates how the method or class can be accessed. types: static and access
Main() Method
Entry Point for all Applications where program begins execution execution ends after last statement in main.
parameters
supply unique data to method appear inside parentheses include data type and an identifier parameter refers to items appearing in the heading ARGUMENT for items appearing in the CALL
Software types
System & Application
overloaded methods
multiple methods with same name. but each has different number or type of parameter -write() -writeline()tn
String
type represents a combination of unicode characters
Pre-increment and Postincrement
operators of ++ and -- add or subtract the number one to and from a memory location
Boolean
have a value of true or false
Steps in Program development
1.Analyze 2.design a solution 3. code the solution 4. implement the code 5. test and debug
OBJECT ORIENTED PROGRAMMING
construct complex systems that model real-world entities.facilitate design components
Compiler
Translates instructions into machine readable form.
value types
include nine integral (whole number types),two floating types and the decimal type.
return type
indicates what type of value is returned when method is completed void - no value being returned required for all non-void methods compatible value returned
Class DIagram
Divided into three sections. 1.name of the class 2.data characteristics 3.shows where actions are to be performed
Class
Building Block of object-oriented program. every program must have at least one class classes define a category or type of object and there are named.
Program Statements
e.g Read() and ReadKey() accept one character from the input device .
IMPLEMENT THE CODE
1.source code ( c# visual basic) 2.compiler 2. intermediate code 3.loader ( class library pre-JIT code) 4.just in time compiler (JITer)( class library pre-JIT code) 5.Machine language (native code)( class library pre-JIT code) 6.Execution
Constants
const - forces the functionality of not allowing the value to be changed
Software
consists of programs.Sets of instructions telling the computer exactly what to do
Camel Case
Hungarian notation first letter of identifier lowercase;first letter of subsequent concatenated words capitalized variables and objects
Floating-point
allows you to keep the fractional portion of a data item
static modifier
indicates member belongs to the type itself rather than to a specific object of a class.
Decimal
format is suitable for financial and monetary calculations
Pascal
First Letter of each word capitalized class,method,namespace,properties
Math Class
public static double POW(double,double) double answer = math.sqrt(25);
Abstraction
determine attributes (data) and behaviors (processes on the data) of the entities
Order of Operations
order in which calculations are performed. Parentheses can be added to an expression to alter the order.
Syntax Error
typing error,misspelled name,forget to end a statement with a semicolon
Invoking a method
calling class methods possibly predefined methods
Algorithm
Clear, step-by-step process for solving a problem. must be expressed so completely and so precisely that all details are included.
Run-Time Error
Failing to fully understand the problem, more difficult to detect
Section 2
(3 cards)