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来自「Algorithms for Image Processing and Comp」· 代码 · 共 20 行

@c ----------------------------------------------------------------------
@node labs, misc
@heading @code{labs}
@subheading Syntax

@example
#include <stdlib.h>

long labs(long x);
@end example

@subheading Description

This function takes the absolute value of @var{x}.  @xref{abs}

@subheading Return Value

|@var{x}|