No Data Type for 80-Bit Precision IEEE Real Numbers in Basic (35248)
The information in this article applies to:
- Microsoft QuickBASIC 3.0
- Microsoft QuickBASIC 4.0
- Microsoft QuickBASIC 4.0b
- Microsoft QuickBASIC 4.5
- Microsoft BASIC Compiler for MS-DOS and OS/2 6.0
- Microsoft BASIC Compiler for MS-DOS and OS/2 6.0b
- Microsoft Basic Professional Development System (PDS) for MS-DOS and MS OS/2 7.0
This article was previously published under Q35248 SUMMARY
QuickBasic's implementation of the ANSI/IEEE Standard 754-1985 for
binary floating-point arithmetic includes two types of real numbers:
Single-precision numbers, which use 32 bits (4 bytes)
Double-precision numbers, which use 64 bits (8 bytes)
The ANSI/IEEE standard also describes an 80-bit (10-byte)
floating-point format called Double Extended. QuickBasic's
intermediate calculations are performed in the 80-bit format for
greater accuracy, but the results are stored in single- or
double-precision variables. There is no data type in QuickBasic
associated with the 80-bit format.
This article applies to the following products, which use IEEE binary
floating-point arithmetic:
- Microsoft QuickBasic Versions 3.00 (QB87.EXE only), 4.00, 4.00b,
and 4.50 for the IBM PC
- Microsoft Basic Compiler Versions 6.00 and 6.00b for MS OS/2 and
MS-DOS
- Microsoft Basic PDS Version 7.00 for MS-DOS and MS OS/2
Modification Type: | Minor | Last Reviewed: | 1/9/2003 |
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Keywords: | KB35248 |
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