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don´t need the "+1", the "%" is enough to garantee r<1.

This commit is contained in:
Roberto Ierusalimschy 1998-12-30 19:23:26 -02:00
parent 59f8e6fb77
commit 4fbb2531b3
1 changed files with 4 additions and 4 deletions
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8
lmathlib.c
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@ -1,5 +1,5 @@
/* /*
** $Id: lmathlib.c,v 1.12 1998/12/28 13:44:54 roberto Exp roberto $ ** $Id: lmathlib.c,v 1.13 1998/12/30 17:22:17 roberto Exp roberto $
** Lua standard mathematical library ** Lua standard mathematical library
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -154,9 +154,9 @@ static void math_max (void)
static void math_random (void) { static void math_random (void) {
/* the '%' is needed because on some systems (SunOS!) "rand()" may /* the '%' avoids the (rare) case of r==1, and is needed also because on
return a value bigger than RAND_MAX... */ some systems (SunOS!) "rand()" may return a value bigger than RAND_MAX */
double r = (double)(rand()%RAND_MAX) / ((double)RAND_MAX+1.0); double r = (double)(rand()%RAND_MAX) / (double)RAND_MAX;
int l = luaL_opt_int(1, 0); int l = luaL_opt_int(1, 0);
if (l == 0) if (l == 0)
lua_pushnumber(r); lua_pushnumber(r);