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Visual Basic Application

Visual Basic Application. Problem. Create a Windows-based application that will calculate the Gross Pay earned for a worker, given the number of hours worked and hourly pay rate. Problem Solving. Input (controls): Hours Worked Hourly Pay Rate Process (event handling): Calculate Gross Pay

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Visual Basic Application

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  1. Visual Basic Application

  2. Problem • Create a Windows-based application that will calculate the Gross Pay earned for a worker, given the number of hours worked and hourly pay rate.

  3. Problem Solving • Input (controls): • Hours Worked • Hourly Pay Rate • Process (event handling): • Calculate Gross Pay • Gross Pay = hoursWorked * hourlyPayRate • Output (controls): • Gross Pay

  4. Creating the Visual Basic Application • Event Driven Programming • Create the Interface / Window first • Input • Output • Then Code the Application • Process • Event Handing Methods

  5. Creating the Interface • Input • Hours Worked  Textbox, Label • Hourly Pay Rate  Textbox, Label • Output • Gross Pay Earned  Label (title), Label (display info) • Events • Calculate Gross Pay  Button • Exit Program  Button

  6. Design the Interface – TOE Chart

  7. Create Your Interface Label Text Box Label Text Box Label Label 2 Buttons

  8. Properties • Form1 • Name = frmWageCalculator • Text = “Wage Calculator” • Label1 • No Need to Rename (Display Only – will not use) • Text = “Number of Hours Worked” • Label2 • No Need to Rename (Display Only) • Text = “Hourly Pay Rate” • Label3 • No Need to Rename (Display Only) • Text = “Gross Pay Earned”

  9. Properties • Textbox1 • Name: txtHoursWorked • Text: <blank> • Textbox2 • Name: txtPayRate • Text: <blank> • Label4 • Name: lblGrossPay (needs name because will will use this label) • Text: <blank> • Autosize: Off • BorderStyle: FixedSingle • Button1 • Name: btnCalculate • Text: “&Calculate Gross Pay” • Button2 • Name: btnExit • Text: “E&xit”

  10. Process – Event Handling • btnCalculate • Button Click Event • Assignment statement • Gets the data from the text field of the txtHoursWorked textbox and the txtPayRate textbox. • Assign the calculation data from the textboxes into the lblGrossPay text field • Val changes the text input from the text box into a number

  11. Event Handling • btnExit • Button Click Event • End

  12. Run & Test Program • Syntax Errors – Language Errors • Caught by the Compiler & Interpreter • Visual Basic – wavy line under problem code • Run-Time Errors • Causes Program to Crash • Logic Errors • Program Runs but gets “Wrong Answer”

  13. Run & Test Program • Must test for expected and unexpected input

  14. Homework • Create a “Multiplication Tables” application. The program should allow the user to input 2 numbers and then display the product of those 2 numbers. (Remember to use the val function)

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