2Software Development Life Cycle GatherRequirementsDesignProgramCode & TestProgramImplementSoftware Development has four main phasesGathering RequirementsProgram DesignCoding & Testing the ProgramImplementing the ProgramThe software development cycle is the process by which a program/application is constructed. While there are many different methodologies (e.g. waterfall), they all have the main phases above.
3CS132 Development Life Cycle GatherRequirementsDesignProgramCode & TestProgramImplementGet requirements document from D2LMake sure you understand the requirementsDesign the form layoutAdd code to the program to meet the requirementsTest the program under several possible scenariosSubmit program for grading in the D2L dropboxFor INFS639, our life cycle is truncated quite a bit. You will get requirements form the book; Some even have screen designs for you. This is a little unrealistic though; that is why two designs (Sept 29 and Oct 13) to do independently. Some of the programs build on each other, so you want to make sure you keep a copy of what you give me. You will be responsible to code and test your programs before submitting. The implementation phase of the life cycle for the class is abbreviated into you handing the program in.
4Program Design Basics A software developer must Design the visual elements (user interface) and logical function of the program to meet the given specificationsThe design is language independent; could be described using flowcharts or pseudocodeImplement this design by writing code that is both functional and easily understood by another programmerThink of the target audience of a program as being other programmers, not just the computerDescribes a programmer’s job. I always think of a programmer as a translator. He or she must be able to translate what the user says they want into something the computer recognizes.
5Design ToolsAlgorithm - finite set of unambiguous instructions, that when given a set of input values, produces the desired outputs, then stopsLike a recipeOften given pseudocode, a programming language-like set of natural language instructionsFlowchart - a graphical language used to communicate the logic of a programFor our purposes, algorithm and pseudocode will be used interchangeably. You may also see the same process called Structured English. They all mean the same thing; a structured way to think about and design code.Flowcharts are a bit antiquated, but the concepts inherent with them is still valid. Again, flowcharts are another way to provide structure to a very unstructured process.
6Describing an Algorithm with Pseudocode Consider the task of making a peanut butter and jelly sandwichGiven a jar of peanut, a jar of jelly, a loaf of sliced bread, and a knife:Take two bread slices from the loafOpen jelly jar; use knife to apply jelly to one slice of breadOpen peanut butter jar; use knife to apply peanut butter to the other slice of breadPlace the bread slices togetherWhat is left out?
7FlowchartsAn alternative, graphical way to describe a program’s designSystem FlowchartProgramFlowchartThere are two main sets of flowcharting symbols: system and program. We are going to deal with the program level in the later chapters when the logic gets a little more complex. For now, we will practice going between algorithms and flowcharts.
8Implementing design To complete our software projects we will need to Understand file management in WindowsAccess the CEAS computer labsBecome familiar with the Visual Basic Integrated Development Environment (IDE)Find information using VB Help
9The Windows File System Double clicking on the “My Computer” icon will invoke the process shown.There are four views of the data, two are shown.Normally, only one view of the window will appear until you open sub-menus.
10Copying FilesOpen two “My Computer” windows, one for the area with files in it and one for the destination areaMark file(s) in first window to be copiedClick on Edit-CopyMove to other windowClick on Edit-Paste
11Single and Multiple Files (1) Click left hand button to select one file and to deselect all others.(2) While holding down Ctrl, click to add a file to selection list.(3) While holding down Shift, click to add a range of files to selection list.
12(Hint for Later)This business of Click, Ctrl-Click, and Shift-Click will come in very handy later when you wish to select Objects in Visual Basic (VB) for various kinds of manipulation.When you want to resize, change font, or move a group of objects, the Ctrl and Shift-Click really works to your advantage.
13Engineering Lab Drives The Engineering Laboratory has several drives available to you. In general they are named A, C, I, Q, R & S.A: The floppy disk drive, 3.5 inch, 1.4 (or 0.7) megabytesC: The local hard drive, belongs to the machine you are sitting in front of (the local machine).I: A part of the disk “farm”. Each of us has his own copy of drive “I” with a 40 megabyte capacity.Q, S: The software “farm”. You may execute some files, copy other but cannot change any of them.R: A part of the disk “farm” with special software for each class. R:\cs132 contains class material.
15I & M T Lab DrivesDrive P on this system is not the same space as Drive I in the Engineering lab system.
16Visual Basic (VB)We will be using the Engineering Laboratory to study programming in the Visual Basic Language.In the pictures that follow we will examine how that tool is installed in the Engineering Laboratory, other machines will most certainly differ.
21Moving VB ProjectsVB allows a program file on drive A to use a form file on drive I.Saving (or copying) a project file to another directory or drive will not move its form fileIf you wish to transport your program on a floppy disk, BE SURE to copy both the .FRM and the .VPB files.
24Selecting ToolsUsing the toolbox and the Workspace Window you can build a form that has nearly any desired appearanceDouble click on an icon in the toolbox to create a new instance of that type of object in your workspaceThese objects are called controlsUsing the mouse, a control can be resized or moved
25The Project WindowThis window allows you to select and open one or more forms that are used in a given project.
26The Form Layout WindowYou may use this window to adjust the position of the form on the CRT screen.Clicking on the “X” will close this window and leave room for other things.
27The Properties WindowThis window allows you to examine and modify the various properties of control objects in a programProperties govern the appearance and behavior of a control objectThey may be modified using the properties window, or by VB code
28To Learn MoreMore material on the VB window can be found in the textbookUsing VB Help you can look under “properties window” or “project window”
29Click on Contents under Help Finding Help in VBClick on Contents under Help
30Finding Visual Basic Help Clicking on the pull down window marked “Active Subject” or “(entire Collection)” will cause a limit to be placed on the searchesMove down to the “Visual Basic Documentation” line
31Contents Page of Help Screen When the contents tab is clicked the various “volumes” of help are shownClicking on the “+” sign opens a volumeClicking on the “-” sign closes it again
32Click on Index under Help Indexed Data in VB HelpClick on Index under Help