CSCI 3133 Section 2 Instructor: Bindra Shrestha

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CSCI 3133 Programming with C Instructor Bindra
Shrestha University of Houston Clear Lake
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Computer Software

• 1. System Software
• Operating System
• 2. Application Software
• General-purpose software-word processors,
  database management systems
• Application Specific Software-ledger system used
  by accountants

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Computing Environments

• 1. Personal Computing Environment
• A Personal Computer
• 2. Time-Sharing Environment
• Many users are connected to one or more
  computers in shared environment.
• 3. Client/Server Environment
• Splits the computing function between a
  central computers and users computers

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Computer Languages

• Machine Language -1940s
• streams of 0s and 1s. Program 1-1 pg.7
• Grace Hopper developed symbolic language in1950s
  which mirrored the machine language, uses symbols
• As assembler translates symbolic language into a
  machine language, they soon became Assembly
  Language. Program 1-2 pg 8.

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Computer Languages

• High -Level Languages-1960s
• must be converted to machine language, the
  process is known as compilation
• FORTRAN,COBAL,C

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Building a C Program
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Building a C Program

• 1. Writing and Editing Programs
• 2. Compiling the Program
• 3. Linking the program with library modules

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Program Development

• 1. Understand the problem
• 2. Develop a solution
• 3. Write the program
• 4. Test the program

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Tools to develop the solution

• 1. Structure Chart -shows how a problem can be
  broken into logical steps. figure 1-12, pg 15
• 2. Pseudocode -steps to accomplish the task in
  English-like statements
• 3. Flowchart-steps to accomplish the task in
  graphical symbols

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Flowchart Symbols

• Oval Denotes begin or End
• Flow line(arrow) direction of logical flow
• Parallelogram denotes input/output operation
• Rectangle denotes a process
• Diamond denotes a decision point (if/then/else)

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Example

• Calculate the Area of a Rectangle
• 1. Prompt the user for length and width
• 2. Store length and width
• 3. Set Arealengthwidth
• 4. Return Area

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Example of Flowchart
Begin

• .

Prompt user length and width
Read length,width
Area lengthwidth
X
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Flowchart contd.

• .