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"random" accepts an 'n' to return between 1 and 'n'.

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This commit is contained in:
Roberto Ierusalimschy 1997-07-30 19:15:18 -03:00
parent 0892f0e5b7
commit caa987faad
2 changed files with 12 additions and 6 deletions
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10
manual.tex
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@ -1,4 +1,4 @@
% $Id: manual.tex,v 2.10 1997/07/02 17:09:48 roberto Exp roberto $ % $Id: manual.tex,v 2.11 1997/07/04 22:35:38 roberto Exp roberto $
\documentstyle[fullpage,11pt,bnf]{article} \documentstyle[fullpage,11pt,bnf]{article}
@ -38,7 +38,7 @@ Waldemar Celes
\tecgraf\ --- Computer Science Department --- PUC-Rio \tecgraf\ --- Computer Science Department --- PUC-Rio
} }
\date{\small \verb$Date: 1997/07/02 17:09:48 $} \date{\small \verb$Date: 1997/07/04 22:35:38 $}
\maketitle \maketitle
@ -2085,8 +2085,10 @@ Both can be used with an unlimited number of arguments.
The functions \verb|random| and \verb|randomseed| are interfaces to The functions \verb|random| and \verb|randomseed| are interfaces to
the simple random generator functions \verb|rand| and \verb|srand|, the simple random generator functions \verb|rand| and \verb|srand|,
provided by ANSI C. provided by ANSI C.
The function \verb|random| returns pseudo-random numbers in the The function \verb|random|, when called without arguments,
range \Math{[0,1)}. returns a pseudo-random real number in the range \Math{[0,1)}.
When called with a number \Math{n},
returns a pseudo-random integer in the range \Math{[1,n]}.
\subsection{I/O Facilities} \label{libio} \subsection{I/O Facilities} \label{libio}

8
mathlib.c
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@ -3,7 +3,7 @@
** Mathematics library to LUA ** Mathematics library to LUA
*/ */
char *rcs_mathlib="$Id: mathlib.c,v 1.24 1997/06/09 17:30:10 roberto Exp roberto $"; char *rcs_mathlib="$Id: mathlib.c,v 1.25 1997/06/19 18:03:04 roberto Exp roberto $";
#include <stdlib.h> #include <stdlib.h>
#include <math.h> #include <math.h>
@ -171,7 +171,11 @@ static void math_rad (void)
static void math_random (void) static void math_random (void)
{ {
lua_pushnumber((double)(rand()%RAND_MAX) / (double)RAND_MAX); double r = (double)(rand()%RAND_MAX) / (double)RAND_MAX;
if (lua_getparam(1) == LUA_NOOBJECT)
lua_pushnumber(r);
else
lua_pushnumber((int)(r*luaL_check_number(1)) + 1);
} }
static void math_randomseed (void) static void math_randomseed (void)