IEG 3080 Tutorial 1

Wilson Ip

Outline

Lecture reviews: Some basics of Software Engineering principle

Some basics of OOP How to use Visual Studio .NET 2005

Create a Project Console HelloWorld program Compile and Debugging tools

Lecture reviews:Software Engineering principle

Potential challenges for building a complex large scale software Difficult to debug

Unreliable software might be delivered. Users change the requirement

A change might propagate throughout whole system Managing large team

Inconsistencies in interpreting the requirement Difficult to merge the work done by independent indivi

duals Difficult to maintain

Maintaining the code from other teams/divisions/people who have been turnover

Possibly more…

Lecture reviews:Software Engineering principle

Solution Source or binary code reuse

adopted the well-written code (but not allowed in assignments and project) Interface and Design Pattern reuse

Make system flexible to change Facilitate future maintenance

Setup a effective way of communication Precise documentation

Visually model the software UML

Software development Methodologies WaterFall Rational Unified Process Extreme Programming

Regression tool NUnit

Lecture reviews:Software Engineering principle

Dealing with a complex System Divide and Conquer

Break a complex problem to simple problems Separation of Interface and Implementation

Promote loose coupling, modularity, encapsulation and abstraction

Object Oriented Programming Traditional programming such as C:

Sequence Condition – if, else if, else Repetition – loop Recursion Variables

Divide big program into subroutines for modular structure

OOP uses Objects for modular structure Object is (in programming):

A module that encapsulates some internal state variables with a group of methods that alone have direct access to those variables.

It can be used to model any real world/abstract objects

Object Oriented Programming

Example objects in real world TV

state - power, volume, contrast, brightness operation - turn on, turn off, vol_up, vol_down, …

to change the state

In modeling, pick out some properties from the real object to be modeled

Example, to model a reader Attribute : name, status, max # of books, # of book lent,

…. Action : lend, return, ….

Object Oriented Programming

This shows an object in programming

The internal attributes cannot be changed without carrying corresponding action. You cannot decrease the

number of books lent without returning the books

Actually, attributes will be internal state variables, actions are the methods .

Name

Status

max # of books

# of book lent

LendReturn

Object Oriented Programming

Class and Object Class – blueprint of an object, specify how t

he object will be built IF WE REALLY BUILD IT

Object – really build the product by following what is specified by the class

Instantiate an object = allocate memory for attributes, codes for the methods specified in the corresponding Class

Analog for the relationship Class – Mold for producing the Moon cake Objects – The Moon cakes produced by this

mold

Object Oriented Programming

Constructor Constructor is used to initialize the attributes

when the object is created Constructor is a function, its name is the same

as that of the class Constructor has no return value There can be more than one constructor in the

same class (By function overloading)

How to use Visual Studio .NET 2005Create a project Menu -> file -> new -> project Choose “Visual C#” Choose “console application” Give a project name, say “308” Choose the location, say “C:\” Then, everything will be within the directory “

C:\308”

How to use Visual Studio .NET 2005 Console HelloWorld program

Function “Main” is the entry pt of the whole program (same as the main() in C/C++)

“static” means that it can be called even no object is allocated, just like “Console.WriteLine”

You can try to simply write a line “Console.WriteLine(“Hello World”); in Main

Using System;Class HelloWorld{

public static void Main(){

Console.WriteLine(“Hello C# world”);}

}

How to use Visual Studio .NET 2005Compile and Debugging Tools Compile

Menu Build Build Solution After compile, execute without debugging

Menu Debug Start Without Debugging Execute with debugging

Menu Debug Start With Debugging Debugging functions:

Step-by-step execution Insert breakpoint

How to use Visual Studio .NET 2005 Compile and Debugging Tools Step-by-step execution:

choose Menu Debug “Step Into” continue to press Menu Debug

“Step Into” to run only the current line of code and go one step to next execution line.

The value of local variable with scope of execution line is shown in left bottom box

You can view a particular variable by select the variable right click “add watch”

If execution come to function call, it jump into the function

If execution come to function call, press Menu Debug “Step over” to skip jumping into a function

If execution inside a function block, press Menu Debug “Step out” to jump out one level from the function block.

How to use Visual Studio .NET 2005 Compile and Debugging Tools Menu Debug “Step Into”

How to use Visual Studio .NET 2005 Compile and Debugging Tools Menu Debug “Step over”

Menu Debug “Step Out”

How to use Visual Studio .NET 2005 Compile and Debugging Tools

Insert a breakpoint : Menu Toggle breakpoint The program will be paused when it hits the break point. You can assign break point at any line in the program.

Insert break point Menu Start with Debugging Program pause at thebreak points

How to use Visual Studio .NET 2005 Compile and Debugging Tools

You can break the program when some condition are fulfilled.

E.g. The break point below is activated only if at the execution that satisfy TestVal2 < 20

Reference

Wikipedia - http://en.wikipedia.org/wiki/Rational_Unified_Process