#### What is the difference between System.Single, System.Double, and System.Decimal datatypes?

`Hi,Anybody know the differences between these datatypes? what should i use for multiplication and division of decimal numbers?thanks!`
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ido
11/14/2005 6:24:50 PM
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```The difference between Single and Double is how large of a number they can hold.A variable defined as Single can hold a number as large as 3.402823e38.  Such a variable consumes 32 bits of system memory.A variable defined as Double can hold a number as large as 1.79769313486232e308.  Such a variable consumes 64 bits of system memory.A Decimal consumes 96 bits of system memory and is best when you need an unusually large number of decimal places to be calculated accurately with little rounding.  It can hold a number as large as 79,228,162,514,264,337,593,543,950,335.If you don't need any decimal places at all then you should generally use an Integer.
Here's more info:http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconthenetframeworkclasslibrary.aspYou should generally be able to do standard mathematical equations with all these variable types.I hope this helps,Steve C. Orr,MCSD, MVP in ASP.NEThttp://SteveOrr.netI hope this helps,Steve C. Orr,http://SteveOrr.net```
 0
Steve
11/14/2005 8:07:14 PM
```This is the difference between the datatypes, or just type the data type in the dynamic help in VS.NETSingle variables are stored as signed IEEE 32-bit (4-byte) single-precision floating-point numbers ranging in value from -3.4028235E+38 through -1.401298E-45 for negative values and from 1.401298E-45 through 3.4028235E+38 for positive values. Single-precision numbers store an approximation of a real number.Double variables are stored as signed IEEE 64-bit (8-byte) double-precision floating-point numbers ranging in value from -1.79769313486231570E+308 through -4.94065645841246544E-324 for negative values and from 4.94065645841246544E-324 through 1.79769313486231570E+308 for positive values.Decimal variables are stored as signed 128-bit (16-byte) integers scaled by a variable power of 10. The scaling factor specifies the number of digits to the right of the decimal point; it ranges from 0 through 28. With a scale of 0 (no decimal places), the largest possible value is +/-79,228,162,514,264,337,593,543,950,335. With 28 decimal places, the largest value is +/-7.9228162514264337593543950335, and the smallest nonzero value is +/-0.0000000000000000000000000001 (+/-1E-28).
Appending the literal type character D to a literal forces it to the Decimal data type. Appending the identifier type character @ to any identifier forces it to Decimal. You might need to use the D type character to assign a large value to a Decimal variable or constant, as the following example shows:Dim BigDec1 As Decimal = 9223372036854775807   ' No overflow.
Dim BigDec2 As Decimal = 9223372036854775808   ' Overflow.
Dim BigDec3 As Decimal = 9223372036854775808D  ' No overflow.
Seven Days Without Laughter Makes One Weak```
 0
maelstorm1983
11/14/2005 8:20:32 PM

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