CHE110-L07 - Variables Data Types CHE110 Introduction to...

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Department of Chemical Engineering Variables & Data Types CHE110 Introduction to Programming & Problem Solving
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Department of Chemical Engineering VBA Naming Rules for Variables Alphabetic/Alphanumeric names acceptable – Alphabetic character as first character – cannot use # , $ , % , & , ! , . , < space > – cannot use keywords (See VBA Language Reference in Help) Variable Names can be up to 254 characters in length Case Insensitive ( e.g. t is equivalent to T ).
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Department of Chemical Engineering VBA Data Types Type Bytes Range Integer 2 +/- 32,767 Long 4 +/- 2,147,483,647 Single 4 +/- ~10 -45 to 10 38 Double 8 +/- ~10 -324 to 10 308 String 10+ 0 to 2 billion Boolean 2 True or False Variant 16 +/- ~10 -324 to 10 308
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Department of Chemical Engineering Variable Declaration and Typing Variables are declared using the Dim keyword. Dim x Creates variable x of type Variant Specific data types are assigned using the As keyword. Dim x As Double Creates variable x of type Double Constants can also be defined using the Const keyword.
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