CS130 Introduction to Programming with VB 6'0

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CS130 Introduction to Programming with VB 6.0

• Fall 2001

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Computer System

• Computer hardware
• Computer software
• Users computer professionals

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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.

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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.

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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.

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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

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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.

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Program development life cycle (PDLC)
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Flowchart symbols tools for algorithm development
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Structured programming (top-down chart or
hierarchy chart or hierarchical input process
output or HIPO)
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Basic construct (building block) of a program
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Basic construct (building block) of a program
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Basic construct (building block) of a program
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Basic construct (building block) of a program
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Basic construct (building block) of a program
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Example sales commission computation for female
and male salespersons for a company
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Object-oriented programming concepts of class,
sub-class, super-class, inheritance, objects
(instances)
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Unified Modeling Language (UML) describing and
documenting an OO system
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Event-driven programming paradigm
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