abs.3

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· 3 代码 · 共 46 行

.TH abs 3
.SH Name
abs, labs \- integer absolute value
.SH Syntax
.nf
.B #include <stdlib.h>
.br
.B #include <stdlib.h>
.PP
.B long labs(\fIi\fP)
.br
.B long \fIi\fP;
.PP
.B int abs(\fIi\fP)
.br
.B int \fIi\fP;
.PP
.B long labs(\fIi\fP)
.br
.B long \fIi\fP;
.fi
.SH Description
.NXR "abs subroutine (standard C)"
.NXR "labs subroutine (ANSI C)"
.NXR "absolute value function"
The
.PN abs
and
.PN labs
functions return the absolute value of their integer operand.  The labs
function does the same for a long int.
.SH Restrictions
Applying the 
.PN abs
or
.PN labs
function to the most negative integer generates a
result which is the most negative integer.  That is, 
.EX
abs(0x80000000)
.EE
.PP
returns 0x80000000 as a result.
.SH See Also
floor(3m)