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CS130 Introduction to Programming with VB 6.0

CS130 Introduction to Programming with VB 6.0. Fall 2001. Computer System. Computer hardware Computer software Users + computer professionals. Hardware. Computer hardware Central Processing Unit (CPU): interprets and executes instructions

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CS130 Introduction to Programming with VB 6.0

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  1. CS130 Introduction to Programming with VB 6.0 Fall 2001

  2. Computer System • Computer hardware • Computer software • Users + computer professionals

  3. Hardware • Computer hardware • Central Processing Unit (CPU): interprets and executes instructions • Main memory (RAM): stores programs/data that are currently being executed/processed; volatile. • Secondary memory (floppy disk, hard disk, CD, DVD): mass backup storage; non-volatile. • Input devices: keyboard, scanners, etc. • Output devices: printers, monitors, etc.

  4. Software • Software = program(s); a program is a list of instructions (coded in a particular programming language) that directs the hardware to perform a specific data processing task.

  5. Two types of software • Systems software: performs system-oriented tasks such as backing up files; typical system software includes the operating system such as MS Windows and compilers • Applications software: performs user-oriented tacks such as wordprocessing; typical applications software includes wordprocessors, Power-point, etc.

  6. Three-levels of Computer Languages • Low-level machine language: 0's and 1's • Intermediate assembler languages: mnemonics; needs translator known as assembler. • High-level procedural languages: needs translators known as compilers; Visual Basic which will be taught in this class is a popular HLL. • Natural or spoken language: an ideal; hard to implement due to ambiguities

  7. Visual Basic a brief history • BASIC: Beginners All-purpose Symbolic Instruction Code, implemented in the 1960s; easily to learn/use; handles only textual data. • Visual BASIC: evolved from BASIC, capable of handling both graphical and textual materials; object-oriented and event-driven language.

  8. Program development life cycle (PDLC)

  9. Flowchart symbols: tools for algorithm development

  10. Structured programming (top-down chart or hierarchy chart or hierarchical input process output or HIPO)

  11. Basic construct (building block) of a program

  12. Basic construct (building block) of a program

  13. Basic construct (building block) of a program

  14. Basic construct (building block) of a program

  15. Basic construct (building block) of a program

  16. Example: sales commission computation for female and male salespersons for a company

  17. Object-oriented programming:concepts of class, sub-class, super-class, inheritance, objects (instances)

  18. Unified Modeling Language (UML): describing and documenting an OO system

  19. Event-driven programming paradigm

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