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Thread: Question About Types

  1. #1

    Thread Starter
    Hyperactive Member
    Join Date
    Jul 1999
    Location
    NY, USA
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    270

    Post

    I may get laughed off this site, but can you explain the difference between a Long, Single, and Double? I have used each one of them, with no clue of what I'm doing with them.

    Thanx,

    ------------------
    Tom Young, 14 Year Old
    tyoung@stny.rr.com
    ICQ: 15743470
    AIM: TomY10
    PERL, JavaScript and VB Programmer

  2. #2
    Former Admin/Moderator MartinLiss's Avatar
    Join Date
    Sep 1999
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    San Jose, CA
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    33,175

    Post

    You won't get laughed at (at least by me), but Help is one place you can always look. Here is what it has to say:
    Code:
    Data Type Summary
       
    
    The following table shows the supporteddata types, including storage sizes and ranges.
    
    Data type Storage size Range 
    Byte 1 byte 0 to 255 
    Boolean 2 bytes True or False 
    Integer 2 bytes -32,768 to 32,767 
    Long
    (long integer) 4 bytes -2,147,483,648 to 2,147,483,647 
    Single
    (single-precision floating-point) 4 bytes -3.402823E38 to -1.401298E-45 for negative values; 1.401298E-45 to 3.402823E38 for positive values 
    Double
    (double-precision floating-point) 8 bytes -1.79769313486232E308 to 
    -4.94065645841247E-324 for negative values; 4.94065645841247E-324 to 1.79769313486232E308 for positive values 
    Currency
    (scaled integer) 8 bytes -922,337,203,685,477.5808 to 922,337,203,685,477.5807 
    Decimal 14 bytes +/-79,228,162,514,264,337,593,543,950,335 with no decimal point; 
    +/-7.9228162514264337593543950335 with 28 places to the right of the decimal; smallest non-zero number is 
    +/-0.0000000000000000000000000001 
    Date 8 bytes January 1, 100 to December 31, 9999 
    Object 4 bytes Any Object reference 
    String 
    (variable-length) 10 bytes + string length 0 to approximately 2 billion  
    String
    (fixed-length) Length of string 1 to approximately 65,400 
    Variant
    (with numbers) 16 bytes Any numeric value up to the range of a Double 
    Variant
    (with characters) 22 bytes + string length Same range as for variable-length String 
    User-defined
    (using Type) Number required by elements The range of each element is the same as the range of its data type. 
    
    
    Note   Arrays of any data type require 20 bytes of memory plus 4 bytes for each array dimension plus the number of bytes occupied by the data itself. The memory occupied by the data can be calculated by multiplying the number of data elements by the size of each element. For example, the data in a single-dimension array consisting of 4 Integer data elements of 2 bytes each occupies 8 bytes. The 8 bytes required for the data plus the 24 bytes of overhead brings the total memory requirement for the array to 32 bytes.
    
    A Variant containing an array requires 12 bytes more than the array alone.
    ------------------
    Marty

    [This message has been edited by MartinLiss (edited 11-10-1999).]

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