INFO: The Difference Among Visual FoxPro Numeric Data Types

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Currency

The Currency data type is new to Visual FoxPro version 3.0. Use it to store monetary amounts. Currency requires 8 bytes in memory and 8 bytes on disk.

With the Currency data type, data is limited to 4 decimal positions of precision. The numeric precision of Currency fields is:

   -92233720368477.5807 to 922337203685477.5807
				

Double

The Double data type is new to Visual FoxPro version 3.0. The double is a floating point numeric stored to disk as an 8-byte binary value. Use the double data type when the numeric precision of numeric, float, or integer fields is insufficient. The numeric precision of double fields is:

   -4.94065648541247E-324 to 1.79769313486232E+308
				

Integer

The Integer data type is new to Visual FoxPro. Use the integer data type to store integers (numeric values without decimal positions). Integers require 4 bytes on disk and in memory. The numeric precision of integer fields is:

   -2147483647 to 2147483646
				

Numeric and Float

The numeric and float data types each existed in FoxPro versions 2.5 and 2.6. In Visual FoxPro, the two data types are identical (float is provided for compatibility reasons only). Use them to store integers or numbers with decimal positions. Numeric and float data types are stored in memory as 6 bytes and are stored on disk from between 1 and 20 bytes. They are stored in a table on disk. The numeric precision of numeric and float fields is:

   .9999999999E+20 to - .9999999999E+19