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# Intro to Excel VBA Programming

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Slide deck from Monday Nov. 11th ITC Programming Event

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### Intro to Excel VBA Programming

1. 1. Intro to VBA Programming Ivey Technology Club
2. 2. Intro to VBA Programming Agenda  Variables    Types Declaration Assignment  Functions/Subroutines   Parameters Returning values  Loops   While For
3. 3. Intro to VBA Programming Agenda  Variables    Types Declaration Assignment  Functions/Subroutines   Parameters Returning values  Loops   While For
4. 4. Intro to VBA Programming  You‟ve seen variables before X =5 Y=X+3  Variables can be reused and changed X =5 X=2 X=X+7  The same principles apply in programming Variables Functions Loops
5. 5. Intro to VBA Programming  Computers are stupid  Must tell them exactly what to do  The more we tell them, the faster they run  Each language does this differently  We will focus on VBA Variables Functions Loops
6. 6. Intro to VBA Programming  All variables should be declared first  This will prevent hard to find errors  It is not required that you do so, but HIGHLY encouraged  To force yourself, use “Option Explicit” at the beginning of VBA files Variables Functions Loops
7. 7. Intro to VBA Programming  To declare a variable in VBA, the basic structure is: Dim <name> as <type> Ex. Dim X as Integer Variables Functions Loops
8. 8. Intro to VBA Programming  Dim means “new Dimension”  Fancy VBA way of saying new variable  When declaring a variable, you should know what it will be used for  Different variable types are used to store different data Variables Functions Loops
9. 9. Intro to VBA Programming  Types include:  Integer (whole numbers like 3)  Float (decimal numbers like 1.25)  Double (just like float, can store wider range of values)  Characters (like „a‟)  String (a number of characters in a row such as “Ivey”)  MANY Variables more Functions Loops
10. 10. Intro to VBA Programming  Types include:  Integer (whole numbers like 3)  Float (decimal numbers like 1.25)  Double (just like float, can store wider range of values)  Characters (like „a‟)  String (a number of characters in a row such as “Ivey”)  MANY Variables more Functions Loops
11. 11. Intro to VBA Programming  To assign a value to a use the “=“ operator  Ex. Dim x As Integer (declare the variable) x=5 Variables Functions Loops
12. 12. Intro to VBA Programming Agenda  Variables    Types Declaration Assignment  Functions/Subroutines   Parameters Returning values  Loops   While For
13. 13. Intro to VBA Programming Functions  Take in input, process it, and produce output Variables Functions Loops
14. 14. Intro to VBA Programming  Functions  General must also be declared format of function declaration: Function <name>(ByVal <parameterName> As <type>) As <returnType>  Subroutines are declared the same way, but do not have a return type Variables Functions Loops
15. 15. Intro to VBA Programming  ByVal refers to “by value”  This will make a copy of the variable and its value  ByRef could also be used  This  Don‟t will modify the original variable worry too much about this for now Variables Functions Loops
16. 16. Intro to VBA Programming  To explicitly return a value from a function, assign the return value to the function name itself Variables Functions Loops
17. 17. Intro to VBA Programming  Subroutines are the same as functions, except for 2 important differences: 1. They do not have explicit return types 2. They cannot be used directly in the spreadsheet Variables Functions Loops
18. 18. Intro to VBA Programming Agenda  Variables    Types Declaration Assignment  Functions/Subroutines   Parameters Returning values  Loops   While For
19. 19. Intro to VBA Programming Loops  Loops allow us to repeatedly perform the same task easily  There are different kinds of loops including:  While  Until  For Variables Functions Loops
20. 20. Intro to VBA Programming  “While” true  “Until” true loops while a certain condition is loops until a certain condition is  “For” loops for a specified number of iterations Variables Functions Loops
21. 21. Intro to VBA Programming Questions, anyone ?