Software Engineering

Software Engineering

Software Engineering

Software Engineering is…

• Design

• Coding

• Testing

• Debugging

• Documentation

• Maintenance

…of new software.

Software Engineering

It may also include…

• Management of programming teams

• Scheduling

• Budget

Software Engineering

C.A.S.E.

• ..stands for Computer Assisted Software Engineering

• Programs that help you develop programs!

Software Engineering

CASE Toolkit…

• Graphics tool ….to help draw flowcharts, data flow diagrams etc…

Software Engineering

CASE Toolkit…

• Interface generator …to allow fast development of …– HCI (Human

Computer Interface), – Menus, – Screen dialogues.

Software Engineering

CASE Toolkit…

• Source code generator …Input the specifications and the program writes the code for you!

Software Engineering

CASE Toolkit…

• Data dictionary …for designing database systems.– Data structure– Entity relationships

Software Engineering

CASE Toolkit

• Project Management Tool …to help with the scheduling of tasks (who does what and when).

Software Engineering

Software Development Tools

• Text Editor – for entering the source code.

• Compiler – converts the source code into executable object code (machine code) program.

• Interpreter – converts each line of source code into executable machine code and executes it as it goes.

Software Engineering

Software Development Tools

• Linker – Links in previously compiled sections of code.

• Loader – Loads previously compiled sections of code into memory.

• A linking loader combines the above two…

Software Engineering

Software Development Tools

• Debugger – A program that helps track down errors (bugs) in a program.

• Program designer – A PDL (program design language) is used to create a program design and then an…

• Application generator … creates the program from the design.

Software Engineering

Debugging Tools

• Break point – Interrupts a program at a specific line.

• Trace – single steps through a program one line at a time.

• Variable watch – watch the value of a variable while single-stepping through the program

• Memory dump – contents of memory can be viewed.

• Error diagnostics – helpful error messages.

Software Engineering

• [5](a)A certain software tool includes a program trace facility and allows for break points to be set up.

•  (i)What name is given to this type of software tool?[1]  • (ii)Outline the role of a program trace facility.[1]  • (iii)Outline the role of a break point.[1]  • (iv)Name one other facility which this type of software tool is likely to

include.[1]  

• (b)Describe what is meant by a subprogram library and give an example of its use.[2]  

• (c)Give an example of an application which might use a special purpose language.[1]  

• (d)Describe two features of CASE tools which could be used during program development.[2]   

• (e)Explain what is meant by the term relocatable code.[1]