/* * File: random.h * Last modified on Fri Jul 22 16:44:36 1994 by eroberts * ----------------------------------------------------- * Library package to produce pseudo-random numbers. */#ifndef _random_h#define _random_h#include "genlib.h"#include <stdlib.h>/* * Constant: RAND_MAX * ------------------ * Unfortunately, several libraries that supposedly conform to * the ANSI standard do not define RAND_MAX in <stdlib.h>.  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