MIST 4600 Computer Programming in Business

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MIST 4600 Computer Programming in Business

• Prof. Dale Goodhue

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Project Identification and Selection
The Systems Design Life Cycle
Project Initiation and Planning
Requirements Determination Logical Design
User Interface Design
Physical Design (Choices of HW/SW, etc.)
Implementation -- Coding and Testing
Maintenance
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Project Identification and Selection
The Systems Design Life Cycle
Project Initiation and Planning
Interface Design Conversion Coding Documentation
Testing Training Support
Requirements Determination Logical Design
User Interface Design
Physical Design (Choices of HW/SW, etc.)
Implementation -- Coding and Testing
Maintenance
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Steps in Program Development

• Define the Problem (What exactly is this program
  supposed to do? What are the inputs, the
  outputs?)
• Outline the Solution (How can it be done? How
  generate the outputs from the inputs? What major
  Steps?)
• Design the User Interface (What will the User
  See, Input?)
• Develop Algorithms for the key events
  (pseudo-code logic for each action object on the
  interface)
• For each key event, Write Code and Test for
  Correctness
• Test the overall program
• Document and Maintain the Program

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Six Basic Computer Operations

• A computer can receive data (INPUT, READ)
• It can store information in memory
• It can put out information (DISPLAY, PRINT)
• It can perform arithmetic (ADD etc.) and assign a
  value to a piece of data (X Y Z)
• It can compare two values and select one of two
  alternative actions (IF/THEN/ELSE)
• It can repeat a group of actions (DO WHILE)

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Filing Cabinet (Customer Account Balances)
Computer Memory
Customer ID
Amount of Withdrawal
Current Balance
Old Balance
Customer ID Balance 1111 1000.00 2222 100.00 333
3 10.00 4444 1.00
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Processes
Outputs
Inputs
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Processes
Inputs
Outputs
Input Values Find That Customer Check
Balance Dispense Cash Update Balance Display
Results
Withdrawal Old Balance New Balance
Customer ID Desired Withdrawal
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ATM Withdrawal Process Get customer ID and
withdrawal amount desired. Find that customer
in the current balances filing cabinet. Get
current balance If withdrawal amount gt
current balance Display Message Insufficient
Funds Else Dispense Cash Set old balance
current balance Calculate current balance
current balance - withdrawal amount Replace
current balance in current balances filing
cabinet. Display withdrawal amount, old
balance, current balance END.