Презентация "Programming with Excel" по информатике – проект, доклад

Microsoft Excel 2007 - Illustrated

Programming with Excel

Microsoft Office Excel 2007 - Illustrated

View VBA code Analyze VBA code Write VBA code Add a conditional statement

Objectives

Prompt the user for data Debug a macro Create a main procedure Run a main procedure

Unit Introduction

Excel macros are written in a programming language called Visual Basic for Applications, or VBA Create a macro with the Excel macro recorder The recorder writes the VBA instructions for you Enter VBA instructions manually Sequence of VBA statements is called a procedure

Viewing VBA Code

View existing VBA code to learn the language To view VBA code, open the Visual Basic Editor Contains a Project Explorer window, a Properties window, and a Code window VBA code appears in the Code window The first line of a procedure is called the procedure header Items displayed in blue are keywords Green notes explaining the code are called comments

Viewing VBA Code (cont.) Comments Procedure header Keyword

Understanding the Visual Basic Editor A module is the Visual Basic equivalent of a worksheet Store macro procedures A module is stored in a workbook, or project, along with worksheets View and edit modules in the Visual Basic Editor

Analyzing VBA Code

Analyzing VBA code Every element of Excel, including a range, is considered an object A range object represents a cell or a range of cells A property is an attribute of an object that defines one of the object’s characteristics, such as size The last line in VBA code is the procedure footer

Analyzing VBA Code (cont.) Selects range object cell A2

Applies bold formatting to range A3:F3

Sets width of columns B-F to AutoFit

Writing VBA Code

To write your own code, open the Visual Basic Editor and add a module to the workbook You must follow the formatting rules, or syntax, of the VBA programming language exactly A misspelled keyword of variable name will cause a procedure to fail

Writing VBA Code (cont.) Comments begin with apostrophes

Information between quotes will be inserted in the active cell

Entering code using AutoComplete To assist you in entering the VBA code, the Editor often displays a list of words that can be used in the macro statement Typically the list appears after you press period [.]

Adding a Conditional Statement

Sometimes you may want a procedure to take an action based on a certain condition or set of conditions One way to add this type of statement is by using an If...Then…Else statement The syntax for this statement is: If condition then statements Else [else statements]

Adding a Conditional Statement (cont.)

Elements of the If…then…Else statement appear in blue

Prompting the User for Data

When automating routine tasks, sometimes you need to pause a macro for user input Use the VBA InputBox function to display a dialog box that prompts the user for information A function is a predefined procedure that returns a value

Prompting the User for Data (cont.)

This text will appear in a dialog box

Comment points out error in next line of the procedure

Debugging a Macro

When a macro procedure does not run properly, it can be due to an error, called a bug, in the code To help you find bugs in a procedure, the Visual Basic Editor steps through the procedure’s code one line at a time When you locate an error, you can debug, or correct it

Debugging a Macro (cont.)

Indicates that the LeftFooter variable is empty

Creating a Main Procedure

Combine several macros that you routinely run together into a procedure This is a main procedure To create a main procedure, type a Call statement for each procedure you want to run

Creating a Main Procedure (cont.)

MainProcedure calls each procedure in the order shown

Running a Main Procedure

Running a main procedure allows you to run several macros in sequence Run a main procedure as you would any other macro

Running a Main Procedure (cont.) Current Module button Printing Macro Procedures Current Project button

Summary

Learn by viewing and analyzing VBA code Write VBA code using the Visual Basic Editor Use If..Then..Else statements for conditional actions Prompt user for data to automate input tasks Use the “Step Into” feature of the Visual Basic Editor to debug macros Use Main procedures to combine several macros