abs.3

操作系统设计与实现源码

.\"	@(#)abs.3	6.1 (Berkeley) 5/15/85
.\"
.TH ABS 3 "May 15, 1985"
.AT 3
.SH NAME
abs \- integer absolute value
.SH SYNOPSIS
.nf
.ft B
#include <stdlib.h>

int abs(int \fIi\fP)
.ft R
.fi
.SH DESCRIPTION
.B Abs
returns the absolute value of its integer operand.
.SH SEE ALSO
.BR floor (3).
.SH BUGS
Applying the \fIabs\fP function to the most negative integer generates a
result which is the most negative integer.  That is, abs(0x80000000)
returns 0x80000000 as a result on a machine with 32-bit ints.  Using the
result in unsigned computations is sound however.