ACC: Data Type of Value Overrides Data Type of Variable
ID: Q98796
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The information in this article applies to:
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Microsoft Access versions 1.0, 1.1, 2.0, 7.0, 97
SUMMARY
Moderate: Requires basic macro, coding, and interoperability skills.
Microsoft Access internally converts values with implicit data type
definitions before assigning those values to variables. This may result
in unexpected rounding of numbers, or in the following error message:
Invalid Number
MORE INFORMATION
You can implicitly define the data type of a value by appending a
type-declaration character at the end of the value. For example,
x=1234& implicitly defines 1234 as a Long data type (four-byte
integer).
To see how this works, follow these steps:
- Open a new module.
- Add the following line underneath the Option Compare Database line:
Dim v as Currency
- Press ENTER.
- On the View menu, click Debug window (or Immediate Window in versions
1.x and 2.0).
- In the Debug window, type the following line, and then press ENTER:
v=123456789123.3456789#
- Type the following line, and then press ENTER again.
debug.print v
Note that the value of the variable <v> is now 123456789123.3457. The
number sign (#) implicitly defined the value as a double-precision
value. Microsoft Access internally converted the value to that data type
before assigning it to the currency variable.
- Repeat steps 5-6, replacing # with other type-declaration characters
(such as the ampersand (&), exclamation point (!), or At sign (@)).
The At sign defines the currency data type, which is limited to
four decimal places. When you try to define a number with more than
four decimal places as currency, an "invalid number" error message
is displayed.
Additional query words:
ui misc
Keywords : kbprg
Version : WINDOWS:1.0,1.1,2.0,7.0,97
Platform : WINDOWS
Issue type : kbinfo
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