Programming with Visual C++: Concepts and Projects Chapter 2B: Reading, Processing and Displaying Data (Tutorial)
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Programming with Visual C++: Concepts and Projects
Chapter 2B:Reading, Processing and Displaying Data
(Tutorial)
Tutorial: Addition Program• Problem Analysis– Create an addition program for double precision
numbers• Design– Sketch the interface– Identify required controls for input, processing
and output– Identify the variables to store two numbers and
their sum– Construct an algorithm for input, processing and
output
Programming with Visual C++: Concepts and Projects
Tutorial: Addition Program
• Development– Create the interface– Code the event handlers
• Testing
Programming with Visual C++: Concepts and Projects
Design
Programming with Visual C++: Concepts and Projects
• Interface sketch– Position each control object on the form as it
should look in the finished product– Name each control object
Design (continued)
Programming with Visual C++: Concepts and Projects
Design (continued)
Programming with Visual C++: Concepts and Projects
• Control table – List the control objects from the interface sketch – Identify their usage (input, processing, output) – List any events associated with them
Design (continued)
Programming with Visual C++: Concepts and Projects
• Data Table– Identify variables that will be required, by name– Assign a data type to each variable (double in this case)– Describe the purpose of the variable
Design (continued)
• After the interface has been designed algorithms must be written for each event handler
• This program has a button• The button has a click event handler requiring
an algorithm
Programming with Visual C++: Concepts and Projects
Design (continued)
• Algorithm1. Declare variables2. Read num13. Read num24. Compute sum5. Display sum
Programming with Visual C++: Concepts and Projects
Development
Programming with Visual C++: Concepts and Projects
• Create the actual interface based on the preliminary sketch you did in the Design stage– Place control objects on the form– Set the properties of these objects
Development (continued)
Programming with Visual C++: Concepts and Projects
Development (continued)
Programming with Visual C++: Concepts and Projects
Development (continued)
Programming with Visual C++: Concepts and Projects
Development (continued)
• The Development stage is where the code must be written for each event handler
• Before writing any Visual C++ code you must have a plan (an low-level algorithm)
• Ideally, from each line of the algorithm a Visual C++ statement can be constructed
Programming with Visual C++: Concepts and Projects
Development (continued)
Programming with Visual C++: Concepts and Projects
Development (continued)
Programming with Visual C++: Concepts and Projects
Development (continued)
• Comments should be added to your code at regular intervals
• Comments are ignored by the compiler• Comment syntax– Line comment
• Used for one line, or a portion of a line• //
– Block comment• Used for multiple lines of comments• /* … */
Programming with Visual C++: Concepts and Projects
Development (continued)
Programming with Visual C++: Concepts and Projects
Testing
• Run the program and enter various numbers into the Textboxes– Check the displayed result for accuracy
Programming with Visual C++: Concepts and Projects
Testing (continued)
Programming with Visual C++: Concepts and Projects
On Your Own
• Modify the interface– Rearrange the control objects
• Add more operations– Implement addition, subtraction, multiplication
and division– Additional buttons are required for each operation
Programming with Visual C++: Concepts and Projects
On Your Own (continued)
Programming with Visual C++: Concepts and Projects
On Your Own (continued)
Programming with Visual C++: Concepts and Projects
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