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Adding Wiring-compatible random(min) and random(min, max) functions (except operating on longs instead of floats).

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This commit is contained in:
David A. Mellis 2006-08-13 09:59:06 +00:00
parent 4ba8ffb6ee
commit cb676dfa2a
2 changed files with 61 additions and 0 deletions
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7
targets/arduino/WProgram.h
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@ -5,5 +5,12 @@
#include <avr/signal.h> #include <avr/signal.h>
#include "wiring.h" #include "wiring.h"
#ifdef __cplusplus
#include "HardwareSerial.h" #include "HardwareSerial.h"
// random prototypes
long random(long);
long random(long, long);
void randomSeed(unsigned int);
#endif

54
targets/arduino/WRandom.cpp Normal file
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@ -0,0 +1,54 @@
/* -*- mode: jde; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
Part of the Wiring project - http://wiring.org.co
Copyright (c) 2004-06 Hernando Barragan
Modified 13 August 2006, David A. Mellis for Arduino - http://www.arduino.cc/
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330,
Boston, MA 02111-1307 USA
$Id$
*/
extern "C" {
#include "stdlib.h"
}
void randomSeed(unsigned int seed)
{
if(seed != 0){
srand(seed);
}
}
long random(long howbig)
{
long value;
if (howbig == 0){
return 0;
}
return rand() % howbig;
}
long random(long howsmall, long howbig)
{
if(howsmall >= howbig){
return howsmall;
}
long diff = howbig - howsmall;
return random(diff) + howsmall;
}