VBA PROGRAMMING IN BUSINESS ECONOMICS

Transkript

1 SANNE WØHLK VBA PROGRAMMING IN BUSINESS ECONOMICS DJØF Publishing Copenhagen

2 To my children Louise, Kristoffer, Sebastian, and Mikkel I hope that you will always appreciate the joy of learning

3 Sanne Wøhlk VBA Programming in Business Economics DJØF Publishing Copenhagen 2010

4 Sanne Wøhlk VBA Programming in Business Economics First Edition, Second Print by DJØF Publishing Copenhagen DJØF Publishing is a company of the Association of Danish Lawyers and Economists All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means electronic, mechanical, photocopying, recording or otherwise without the prior written permission of the Publisher. Print: Toptryk Grafisk, Gråsten Printed in Denmark 2011 ISBN Sold and distributed in North America by: International Specialized Book Services (ISBS) Portland, OR 97213, USA Sold and distributed in Scandinavia by: DJØF Publishing Copenhagen Denmark forlag.dk Sold and distributed in all other countries by: The Oxford Publicity Partnership Ltd. Towcester NN12 6BT, UK www. oppuk.co.uk DJØF Publishing 17, Lyngbyvej P.O.Box 2702 DK 2100 Copenhagen Denmark Phone: Fax: E mail: forlag.dk

5 5 Table of Contents Introduction Chapter 1 VBA and Your First Program What is VBA The Developer Tab The VBA Editor Insert a Module Write Your First Macro Execute your First Macro Save a Workbook that Contains Macros Exercises Chapter 2 The Macro Recorder How to Record a Macro Viewing the Recorded Code Using Relative References Limitations of the Macro Recorder Exercises Chapter 3 Try it Out Getting Started Variables Accessing the Worksheet Input and Output Message Box Input Box Using Excel and VBA Functions Making Decisions Looping Good Programming Practice Structure Your Code Naming Convention Commenting/Documenting Indention Putting it all Together Example: Delayed Products Exercises... 47

6 6 Chapter 4 Variables Types of Variables Declaring Variables Scope of Variables Local Variables Module and Global Variables Who is in Charge? Arrays Dynamic Arrays Multi Dimensional Arrays Exercises Chapter 5 Subs and Functions Custom Procedures Subs Functions Using Arguments in Procedures Public vs Private Procedures VBA Functions Number and Math Functions Date and Time Functions Financial Functions Other Functions Worksheet Functions Using Worksheet Functions in Your Code Examples of Worksheet Functions Exercises Chapter 6 Decisions and Looping Arithmetic and Comparison Arithmetic Comparison Decisions If Then Else Select Case Looping The For Next Loop The While Loop The Do Loops Be Aware of Endless Looping Nested Loops Example: Calculate Distances Example: Gantt Chart Example: Sequencing of Jobs

7 7 6.5 Jumping GoTo Exit Exercises Chapter 7 Workbooks, Worksheets, and Ranges The Object Model Referring to an Object Properties and Methods Collections Object Variables The Object Browser Ranges Size of the Region Sorting Other Range Properties and Methods Worksheets Workbooks The Application Object For Each Loops With Statements Exercises Chapter 8 Security Set Macro Security Trusted Sources Trusted Locations Trusted Digital Certificates Create a Digital Certificate Sign Your Code with Your Digital Certificate Protecting Your Work Prevent Others from View or Changing Your Code Prevent Others from Executing Your Program Chapter 9 Debugging Avoid the Need for Debugging VBA Debugging Tools Step Into or Single Stepping Step Over Step Out Break Point Break Mode Locals Watch The Immediate Window

8 Run Time Errors Exercises Chapter 10 Design of Programs The Process of Creating a Program Designing a Program Example: Simple Production Planning Example: Reservation Problem Use of Flow Charts in Designs Chapter 11 Making it Easier to Use Your Code The Personal Workbook Executing a Macro Use Alternative Buttons to Execute a Macro Use a Shortcut Key to Execute a Macro Quick Access Toolbar Toolbar in the Ribbon Create and Use Your Own Add In Preparing the Workbook Creating the Add In Installing an Add In Exercises Chapter 12 Files The File System Working with Folders Create a New Folder Delete a Folder Display Sub Folders Working with Files Get Information about Files Check if a File Exists Check if a Workbook is Open Count Workbooks in Folder Working with Text Files Exercises Chapter 13 Strings Working with Strings String Functions Exercises

9 9 Chapter 14 Charts Chart Sheets and Embedded Charts Basic Chart Operations Check if a Chart Exists Delete Charts Display Names of Charts Charts in Action Example: Sales Example: Advertisement Example: Members Example: Sales Revisited Example: The Traveling Salesman Problem Example: The Vehicle Routing Problem Exercises Chapter 15 Built in Dialog Boxes Message Boxes Input Boxes The Application Input Box Other Built in Dialog Boxes Chapter 16 User Forms Controls Event Programming Designing the First User Form Insert the User Form Changing the Appearance of the User Form Show the User Form Adding Controls to the User Form Properties Tab Order Short Cut Keys Automating the User Form User Forms in Action Example: Selecting Flights Example: Select Background Picture Example: People Information Revisited Example: Running Experiment Exercises Chapter 17 Solver Introduction to Solver Preparing the Worksheet Using the Solver Preparing the File for Combining Solver and VBA

10 Using Solver from the VBA Code A Small Example A Walk Through the Functions Solver in Action Example: Adding Additional Constraints Example: Transportation Problem Example: Solving Problems of Flexible Size Exercises Chapter 18 Simulation Generation of Random Numbers Use Simulation to Compare Strategies Example: Production Planning Example: Inventory Control Introduction to Crystal Ball Example: Investment Example: Sales Using Crystal Ball from the VBA Code Example: Sales Revisited Example: Sales Extended Version Exercises Index