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(Integer Representations): Simplify; delete xref to containing chapter.

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Richard Stallman 2022-09-30 11:03:02 -04:00
parent 2b017543cc
commit 6eeb5e1743
1 changed files with 10 additions and 9 deletions
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@ -12181,18 +12181,19 @@ bits has a range from @math{-2@sup{(@var{n} - 1)}} to @minus{}1 to 0
to 1 to @math{+2@sup{(@var{n} - 1)} - 1}, inclusive. The leftmost, or
high-order, bit is called the @dfn{sign bit}.
@c ??? Needs correcting
In two's-complement representation, there is only one value that means
zero, and the most negative number lacks a positive counterpart. As a
result, negating that number causes overflow; in practice, its result
is that number back again. We will revisit that peculiarity shortly.
There is only one value that means zero, and the most negative number
lacks a positive counterpart. As a result, negating that number
causes overflow; in practice, its result is that number back again.
For example, a two's-complement signed 8-bit integer can represent all
decimal numbers from @minus{}128 to +127. We will revisit that
peculiarity shortly.
decimal numbers from @minus{}128 to +127. Negating @minus{}128 ought
to give +128, but that value won't fit in 8 bits, so the operation
yields @minus{}128.
Decades ago, there were computers that didn't use two's-complement
representation for integers (@pxref{Integers in Depth}), but they are
long gone and not worth any effort to support.
Decades ago, there were computers that used other representations for
signed integers, but they are long gone and not worth any effort to
support. The GNU C language does not support them.
@c ??? Is this duplicate?