/*
* File: random.h
* Version: 1.0
* Last modified on Fri Jul 22 16:44:36 1994 by eroberts
* -----------------------------------------------------
* This interface provides several functions for generating
* pseudo-random numbers.
*/
#ifdef __cplusplus
#pragma message ( "You are compiling in C++ mode which will probably cause compile errors with" )
#pragma message ( "the 'bool' type as well as link errors such as 'undefined external symbol'." )
#pragma message ( "Most likely, you have saved your source code with a name ending in .cpp;" )
#pragma message ( "it needs to end in .c." )
#endif
#ifndef _random_h
#define _random_h
#include "genlib.h"
#include
/*
* Constant: RAND_MAX
* ------------------
* Unfortunately, several libraries that supposedly conform to
* the ANSI standard do not define RAND_MAX in . To
* reduce portability problems, this interface defines RAND_MAX
* to be the largest positive integer if it is undefined.
*/
#ifndef RAND_MAX
# define RAND_MAX ((int) ((unsigned) ~0 >> 1))
#endif
/*
* Function: Randomize
* Usage: Randomize();
* -------------------
* This function sets the random seed so that the random sequence
* is unpredictable. During the debugging phase, it is best not
* to call this function, so that program behavior is repeatable.
*/
void Randomize(void);
/*
* Function: RandomInteger
* Usage: n = RandomInteger(low, high);
* ------------------------------------
* This function returns a random integer in the range low to high,
* inclusive.
*/
int RandomInteger(int low, int high);
/*
* Function: RandomReal
* Usage: d = RandomReal(low, high);
* ---------------------------------
* This function returns a random real number in the half-open
* interval [low .. high), meaning that the result is always
* greater than or equal to low but strictly less than high.
*/
double RandomReal(double low, double high);
/*
* Function: RandomChance
* Usage: if (RandomChance(p)) . . .
* ---------------------------------
* The RandomChance function returns TRUE with the probability
* indicated by p, which should be a floating-point number between
* 0 (meaning never) and 1 (meaning always). For example, calling
* RandomChance(.30) returns TRUE 30 percent of the time.
*/
bool RandomChance(double p);
#endif
