Run time error 6 Overflow

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  15 years ago

  by ZiV

  Vladimír Židlík

  Czech republic, United States

  Joined 15 years ago

  Hi all,

  why following code end by "Run time error 6 Overflow"?

  .....

  Dim byI As Byte
  For byI = 5 To 1 Step -1
  Next byI
  
  

  .....
  
  

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  15 years ago

  by chrisdickson

  Chris Dickson

  Woking, England, United Kingdom

  Joined 15 years ago

  As you have declared byI to be a Byte, this means that the Step -1 is typed as Byte. -1 can not be represented by the Byte data type, so the overflow occurs. You probably need to use an Integer.
  
  See this from MSDN
  
  
  
  

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  15 years ago

  by alpha7s2ar

  alpha7s2ar

  Yorkshire, United Kingdom

  Joined 15 years ago

  Just out of Intrest can you use a two's complement system in visual basic to represent negative numbers? e.g. the most significant bit is negative.

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  15 years ago

  by chrisdickson

  Chris Dickson

  Woking, England, United Kingdom

  Joined 15 years ago

  No. There is no concept of unsigned in the intrinsic VB6 types, so you are limited by what VB has to offer. For example, VB6 provides a Long, but there is no equivalent Unsigned Long, such as you might be able to do in C, where the underlying storage is the same size (e.g. 4 bytes) but the MSB is treated differently.

  Again, I refer you to MSDN using this link describing the available data types.

  The only unsigned type is the Byte.

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  15 years ago

  by alpha7s2ar

  alpha7s2ar

  Yorkshire, United Kingdom

  Joined 15 years ago

  lol ok I know the datatypes I've never had much reason to work with the byte datatype as of yet was just curious don't byte my head off, yes cheap joke I know lol

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