Declare a variable as Decimal

Question

I m optimizing a macro in VBA which had none of the data types declared  so everything was clumsily treated by the compiler as a variant  I m dealing with scientific measurements  so I need precision  How do I declare Dim decAsdf as Decimal  not like that but the proper way

User · Answer

You can t declare a variable as Decimal - you have to use Variant  you can use CDec to populate it with a Decimal type though

User · Answer

The best way is to declare the variable as a Single or a Double depending on the precision you need   The data type Single utilizes 4 Bytes and has the range of -3 402823E38 to 1 401298E45   Double uses 8 Bytes   You can declare as follows   Dim decAsdf as Single   or  Dim decAsdf as Double   Here is an example which displays a message box with the value of the variable after calculation   All you have to do is put it in a module and run it   Sub doubleDataTypeExample   Dim doubleTest As Double   doubleTest   0 0000045   0 005   0 01  MsgBox  doubleTest      amp  doubleTest End Sub

User · Answer

To declare a variable as a Decimal  first declare it as a Variant and then convert to Decimal with CDec  The type would be Variant Decimal in the watch window     Considering that programming floating point arithmetic is not what one has studied during Maths classes at school  one should always try to avoid common pitfalls by converting to decimal whenever possible    In the example below  we see that the expression    0 1   0 11   0 21  is either True or False  depending on whether the collectibles  0 1 0 11  are declared as Double or as Decimal   Public Sub TestMe        Dim preciseA As Variant  preciseA   CDec 0 1      Dim preciseB As Variant  preciseB   CDec 0 11       Dim notPreciseA As Double  notPreciseA   0 1     Dim notPreciseB As Double  notPreciseB   0 11      Debug Print preciseA   preciseB     Debug Print preciseA   preciseB   0 21  True      Debug Print notPreciseA   notPreciseB     Debug Print notPreciseA   notPreciseB   0 21  False  End Sub

[excel] Declare a variable as Decimal

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