ME 142 Engineering Computation I Variables, Equations & Functions Introduction to Basic Programming Language
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ME 142Engineering Computation I
Variables, Equations & Functions
Introduction to Basic Programming
Language
Enabling the Developer’s Ribbon
Launching VBA
Enable Developer’s Tab
Once enabled, should remain enabled
Select Visual Basic from Developer’s Tab
Shortcut key: Alt+F11
Launching VBA
Right click on
Project…
Select
Insert/Module
Launching VBA
Congratulations, you’re ready to begin programming!
Tips for Beginning VBA
Begin by downloading the proper template
file
Make sure you are working in Module 1
Place your code in this module
Don’tforget to enter your ProbID
ProbID = “12AB”
Example Program
Develop a function to calculate and return
the cube root of a number.
Use template for PP 4.2.4
Use ProbID = “12AB”
Key Concepts
Defining Variables & Equations
Launching VBA
Programming Basics
Defining Variables & Equations
What is a Variable?
Variables
A named element that stores information or data
Variable examples:
A=2.45
X=Y+Z
I=I+1
B=“Hello Class”
Basic Math Operators
Same as used in Excel spreadsheets
+ add
- subtract
* multiply
/ divide
( ) parenthesis
^ exponent
Launching VBA
Enabling the Developer’s Ribbon
Launching VBA
Enable Developer’s Tab
Once enabled, should remain enabled
Select Visual Basic from Developer’s Tab
Launching VBA
Right click on
Project…
Select
Insert/Module
Launching VBA
Congratulations, you’re ready to begin programming!
Programming Basics
Example VBA Function
Function demo(a,b) ' (Input)
'An example program to add two numbers
'Add 2 numbers (Process)
c = a + b
'Return results (Output)
demo= c
End Function
Executing a VBA Function
Saving a VBA Program
How do you save a program?
What is a macro-enabled workbook?
Where is the program saved?
How do I retrieve a program?
What is this error about macros that I get
when I try to open my saved excel file?
Excel/VBA Tip
The VBA Function worksheetfunction may
be used to call Excel function:
P=worksheetfunction.pi
D=worksheetfunction.degrees(x)
Example Problem
Develop a VBA function to calculate the
volume of a sphere, given its radius, r.
Volume = 4 * π * r3 / 3
Use your new VBA function within Excel
to find the total volume of the metal used
to make the cannonball pyramid below,
given d=4.5”
Review Questions
I-Clicker QuestionVariables
Which of the following variable assignments
are valid:
A. x = y + z
B. y + z = x
C. Both are valid variable assignments
D. Neither are valid variable assignments
I-Clicker QuestionLaunching VBA
The shortcut to launch the VBA editor is:
A. Alt + V + B
B. F7
C. Alt + F11
D. None of the above
E. There is no shortcut
I-Clicker QuestionRunning VBA
In the first line of a function, the parenthesis
immediately after the function name may be
omitted:
A. True
B. False
Homework Help ‘n Hints
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