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`-=[]โŸจโŸฉ\;',./~!@#$%^&*()_+{}|:"<>? ๐‘Ž๐‘๐‘๐‘‘๐‘’๐‘“๐‘”โ„Ž๐‘–๐‘—๐‘˜๐‘™๐‘š๐‘›๐‘œ๐‘๐‘ž๐‘Ÿ๐‘ ๐‘ก๐‘ข๐‘ฃ๐‘ค๐‘ฅ๐‘ฆ๐‘ง ร…โ€‰โˆ’โ€‚ร—โ€ƒโ‹…โˆ“ยฑโˆ˜๊žŠ๏นฆโˆ—โˆ™ โ„ฏ ๐”ธ๐”นโ„‚๐”ป๐”ผ๐”ฝ๐”พโ„๐•€๐•๐•‚๐•ƒ๐•„โ„•๐•†โ„™โ„šโ„๐•Š๐•‹๐•Œ๐•๐•Ž๐•๐•โ„ค๐ด๐ต๐ถ๐ท๐ธ๐น๐บ๐ป๐ผ๐ฝ๐พ๐ฟ๐‘€๐‘๐‘‚๐‘ƒ๐‘„๐‘…๐‘†๐‘‡๐‘ˆ๐‘‰๐‘Š๐‘‹๐‘Œ๐‘ โˆผโˆฝโˆพโ‰โ‰‚โ‰ƒโ‰„โ‰…โ‰†โ‰‡โ‰ˆโ‰‰โ‰Œโ‰โ‰ โ‰ก โ‰คโ‰ฅโ‰ฆโ‰งโ‰จโ‰ฉโ‰ชโ‰ซ โˆˆโˆ‰โˆŠโˆ‹โˆŒโˆ โŠ‚โŠƒโŠ„โŠ…โŠ†โŠ‡ ๐›ผ๐›ฝ๐›พ๐›ฟ๐œ€๐œ๐œ‚๐œƒ๐œ„๐œ…๐œ†๐œ‡๐œˆ๐œ‰๐œŠ๐œ‹๐œŒ๐œŽ๐œ๐œ๐œ‘๐œ’๐œ“๐œ” โˆ€โˆ‚โˆƒโˆ…โฆฐโˆ†โˆ‡โˆŽโˆžโˆโˆดโˆต โˆโˆโˆ‘โ‹€โ‹โ‹‚โ‹ƒ โˆงโˆจโˆฉโˆช โˆซโˆฌโˆญโˆฎโˆฏโˆฐโˆฑโˆฒโˆณ โˆฅโ‹ฎโ‹ฏโ‹ฐโ‹ฑ โ€– โ€ฒ โ€ณ โ€ด โ„ โ— สน สบ โ€ต โ€ถ โ€ท ๏น ๏น‚ ๏นƒ ๏น„ ๏ธน ๏ธบ ๏ธป ๏ธผ ๏ธ— ๏ธ˜ ๏ธฟ ๏น€ ๏ธฝ ๏ธพ ๏น‡ ๏นˆ ๏ธท ๏ธธ โœ   โ   โŽด  โŽต  โž   โŸ   โ    โก โ†โ†‘โ†’โ†“โ†คโ†ฆโ†ฅโ†งโ†”โ†•โ†–โ†—โ†˜โ†™โ–ฒโ–ผโ—€โ–ถโ†บโ†ปโŸฒโŸณ โ†ผโ†ฝโ†พโ†ฟโ‡€โ‡โ‡‚โ‡ƒโ‡„โ‡…โ‡†โ‡‡ โ‡โ‡‘โ‡’โ‡“โ‡”โ‡Œโ‡โ‡โ‡•โ‡–โ‡—โ‡˜โ‡™โ‡™โ‡ณโฅขโฅฃโฅคโฅฅโฅฆโฅงโฅจโฅฉโฅชโฅซโฅฌโฅญโฅฎโฅฏ
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Content

VB.NET Data Types
โ€ƒ Single Data Type
โ€ƒโ€ƒRemarks
โ€ƒโ€ƒProgramming Tips
โ€ƒโ€ƒSee also
โ€ƒ Double Data Type
โ€ƒโ€ƒRemarks
โ€ƒโ€ƒProgramming Tips
โ€ƒSee also
โ€ƒ Source/Reference

VB.NET Data Types

The supporting VB.NET data types can be divided into

  • Specific forms: String, Object, User-Defined
  • Typical forms: Boolean, Char(2), Date(8), Decimal(16)
  • Unsigned numerics: Byte (1), UShort(2), UInteger(4), ULong(8)
  • Singed numerics:  SByte(1), Short(2), Integer(4), Long(8)
  • Numeric ranges: Single(4), Double(8)

Single Data Type

Holds 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.

Remarks

Use the Single data type to contain floating-point values that do not require the full data width of Double. In some cases the common language runtime might be able to pack your Single variables closely together and save memory consumption.

The default value of Single is 0.

Programming Tips

  • Precision. When you work with floating-point numbers, keep in mind that they do not always have a precise representation in memory. This could lead to unexpected results from certain operations, such as value comparison and the Mod operator. For more information, see Troubleshooting Data Types.

  • Widening. The Single data type widens to Double. This means you can convert Single to Double without encountering a System.OverflowException error.

  • Trailing Zeros. The floating-point data types do not have any internal representation of trailing 0 characters. For example, they do not distinguish between 4.2000 and 4.2. Consequently, trailing 0 characters do not appear when you display or print floating-point values.

  • Type Characters. Appending the literal type character F to a literal forces it to the Single data type. Appending the identifier type character ! to any identifier forces it to Single.

  • Framework Type. The corresponding type in the .NET Framework is the System.Single structure.

See also

Double Data Type

Holds signed IEEE 64-bit (8-byte) double-precision floating-point numbers that range 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. Double-precision numbers store an approximation of a real number.

Remarks

The Double data type provides the largest and smallest possible magnitudes for a number.

The default value of Double is 0.

Programming Tips

  • Precision. When you work with floating-point numbers, remember that they do not always have a precise representation in memory. This could lead to unexpected results from certain operations, such as value comparison and the Mod operator. For more information, see Troubleshooting Data Types.

  • Trailing Zeros. The floating-point data types do not have any internal representation of trailing zero characters. For example, they do not distinguish between 4.2000 and 4.2. Consequently, trailing zero characters do not appear when you display or print floating-point values.

  • Type Characters. Appending the literal type character R to a literal forces it to the Double data type.

    Appending the identifier type character # to any identifier forces it to Double.

  • Framework Type. The corresponding type in the .NET Framework is the System.Double structure.

See also

Source/Reference

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References

  1. Active Server Pages, โ€‰, http://msdn.microsoft.com/en-us/library/aa286483.aspx
  2. ASP Overview, โ€‰, http://msdn.microsoft.com/en-us/library/ms524929%28v=vs.90%29.aspx
  3. ASP Best Practices, โ€‰, http://technet.microsoft.com/en-us/library/cc939157.aspx
  4. ASP Built-in Objects, โ€‰, http://msdn.microsoft.com/en-us/library/ie/ms524716(v=vs.90).aspx
  5. Response Object, โ€‰, http://msdn.microsoft.com/en-us/library/ms525405(v=vs.90).aspx
  6. Request Object, โ€‰, http://msdn.microsoft.com/en-us/library/ms524948(v=vs.90).aspx
  7. Server Object (IIS), โ€‰, http://msdn.microsoft.com/en-us/library/ms525541(v=vs.90).aspx
  8. Application Object (IIS), โ€‰, http://msdn.microsoft.com/en-us/library/ms525360(v=vs.90).aspx
  9. Session Object (IIS), โ€‰, http://msdn.microsoft.com/en-us/library/ms524319(8v=vs.90).aspx
  10. ASPError Object, โ€‰, http://msdn.microsoft.com/en-us/library/ms524942(v=vs.90).aspx
  11. ObjectContext Object (IIS), โ€‰, http://msdn.microsoft.com/en-us/library/ms525667(v=vs.90).aspx
  12. Debugging Global.asa Files, โ€‰, http://msdn.microsoft.com/en-us/library/aa291249(v=vs.71).aspx
  13. How to: Debug Global.asa files, โ€‰, http://msdn.microsoft.com/en-us/library/ms241868(v=vs.80).aspx
  14. Calling COM Components from ASP Pages, โ€‰, http://msdn.microsoft.com/en-us/library/ms524620(v=VS.90).aspx
  15. IIS ASP Scripting Reference, โ€‰, http://msdn.microsoft.com/en-us/library/ms524664(v=vs.90).aspx
  16. ASP Keywords, โ€‰, http://msdn.microsoft.com/en-us/library/ms524672(v=vs.90).aspx
  17. Creating Simple ASP Pages, โ€‰, http://msdn.microsoft.com/en-us/library/ms524741(v=vs.90).aspx
  18. Including Files in ASP Applications, โ€‰, http://msdn.microsoft.com/en-us/library/ms524876(v=vs.90).aspx
  19. ASP Overview, โ€‰, http://msdn.microsoft.com/en-us/library/ms524929(v=vs.90).aspx
  20. FileSystemObject Object, โ€‰, http://msdn.microsoft.com/en-us/library/z9ty6h50(v=vs.84).aspx
  21. http://msdn.microsoft.com/en-us/library/windows/desktop/ms675944(v=vs.85).aspx, โ€‰, ADO Object Model
  22. ADO Fundamentals, โ€‰, http://msdn.microsoft.com/en-us/library/windows/desktop/ms680928(v=vs.85).aspx
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