INFO: Negative Values Use Two's Complement (38027)
The information in this article applies to:
- Microsoft Visual C++ for Windows, 16-bit edition 1.0
- Microsoft Visual C++ for Windows, 16-bit edition 1.5
- Microsoft Visual C++, 32-bit Editions 1.0
- Microsoft Visual C++, 32-bit Editions 2.0
- Microsoft Visual C++, 32-bit Editions 4.0
- Microsoft Visual C++, 32-bit Editions 5.0
- Microsoft Visual C++, 32-bit Editions 6.0
This article was previously published under Q38027 SUMMARY
In most C compilers, including the Microsoft C Compiler, negative values
are represented internally in two's complement format. Two's complement can
be obtained by negating each bit of the value, then adding 1. Performing
two's complement twice generates the original value.
The following is an example:
Original Value Two's Complement
-------------- ----------------
(dec) (hex) (binary) (dec) (hex) (binary)
127 0x7f 01111111 -127 0x81 10000001
111 0x6f 01101111 -111 0x91 10010001
-111 0x91 10010001 111 0x6f 01101111
| Modification Type: | Minor | Last Reviewed: | 7/5/2005 |
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| Keywords: | kbCompiler kbinfo KB38027 |
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