Input, Output, and Processing

Input, Output, and Processing

1. Designing a Program

   • Program Development Cycle
     • Writing code following language syntax rules
     • Testing for logic errors
     • Debugging code
     • Revising design if needed
   • Program Design Steps:
     • Understand program task
       • Interview customer
       • Create software requirements list
     • Determine required steps
       • Break task into logical steps
       • Create an algorithm
   • Design Tools
     • Pseudocode
       • Informal language without syntax rules
       • Used to create program models
       • Helps focus on design without syntax concerns
     • Flowcharts
       • Diagrams showing program steps
       • Key symbols
         • Terminal symbols (ovals) - Start/End
         • Parallelograms - Input/Output
         • Rectangles - Processing
         • Connector symbols - Link multiple flowcharts

2. Output, Input, and Variables

   • Basic Program Process
     • Receive input
       • Process data
         • Produce output
   • Key Tools
     • IPO Charts - Input, Processing, Output planning
   • Sequence Structures - Statements executing in order
   • Strings - Character sequences used as data
   • String Literals - Strings in program code (in quotes)
   • Variables
     • Named memory storage locations
     • Naming Rules
       • One word (no spaces)
       • Usually only letters and numbers
       • Can't start with number
       • Use descriptive names
     • Naming Conventions
       • Underscore method
       • CamelCase method

3. Variable Declaration and Data Types

   • Variables must be
     • Declared before use
     • Specify name and data type
   • Important Concepts
     • Variable Initialization - Assign initial value
     • Uninitialized Variables - May contain "garbage" values
     • Numeric Literals - Numbers in code
     • Integer Division - Truncates decimal results

4. Named Constants

   • Represent unchangeable values
   • Must be initialized when declared
   • Use UPPERCASE naming convention
   • Makes code self-explanatory
   • Easier to maintain

5. Documenting a Program

   • Documentation Types
     • Internal Documentation
       • Comments in code
         • Types
           • Block comments (multiple lines)
           • Line comments (single line)
     • External Documentation
       • For users
       • Reference guides and tutorials

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