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Using Variables

This guide provides an overview of variable declaration using the 'Dim' keyword in programming. Learn how to name variables properly, ensure they are within character limits, and how to set data types like Integer, Double, Currency, and String. It includes examples such as Dim intA As Integer and workflows for better code readability and modification. Additionally, explore how to gather user input through various controls like text boxes and radio buttons, and understand basic integer arithmetic operations with examples.

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Using Variables

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  1. Using Variables

  2. Declaring Variables Dim <variable name> As <data type> Variable Name (identifier) • Begin with a letter • Only letters, digits, and the underscore _ • Fewer than 255 characters

  3. Data Types

  4. Examples • Dim intA As Integer • Dim dblTaxRate As Double • Dim TaxAmount As Currency • Dim MyName As String

  5. Constants • Make program easier to read dblArea = dblRadius * dblRadius * 3.14 dblArea = dblRadius * dblRadius * dblPi • Make program easier to modify dblTotal = dblPurchase * .06 dblTotal = dblPurchase * dblTaxrage

  6. Getting Input from the User • Text box • Radio Buttons • Check Boxes Example:

  7. Integer Arithmetic: \ • the “\” returns the integer part of division • 7 \ 2 return 3 • 12 \ 5 returns 2 • 35 \ 7 returns 5 • 35 \ 6 returns 5

  8. Integer Arithmetic: Div • The Mod operator returns the remainder of division. • 7 Mod 2 returns 1 • 12 Mod 5 returns 2 • 35 Mod 7 returns 0 • 35 Mod 6 returns 5

  9. Using Option (Radio) Buttons • Use when you want to force the user to make EXACTLY one choice Example

  10. The End

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