random.h

来自「数据结构」· C头文件 代码 · 共 53 行

#ifndef _random
#define _random

class random//随机数类
{
public:
	random( );
	random(unsigned short initialSeed);
	unsigned short randomInteger();
	double randomReal();
	double between(double low, double high);
	int between(int low,int high);

private:
	unsigned short seed;
};

random randgen;

random::random()//种子
{
	seed=48611;
}

unsigned short random::randomInteger()
{
	const long multiplier=44449;
	const long adder=649801;
	seed=(multiplier*seed+adder)%3163787;
	return seed;
}
  
double random::randomReal()
{
	double dseed=randomInteger();
	return dseed/6553.0;
}

double random::between(double low,double high)
{
	return low+(high-low)*randomReal();
}
 
int random::between(int low,int high)
{
	return low+randomInteger()%(high-low+1);
}

#endif