Using Variables

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