random.h

来自「数据结构各种算法的比较程序」· C头文件 代码 · 共 39 行

#ifndef RANDOM
#define RANDOM
class random
{
public:
	random();
	random(unsigned short initialSeed);
	unsigned  short randomInterger();
	double randomReal();
	double between(double  low ,double high);
	int between(int low,int high);
private:
	unsigned short seed;
};
random::random()
{
	seed=48611;
}
unsigned short random::randomInterger()
{
	const long multiplier=44449;
	const long adder=649801;
	seed=(multiplier*seed+adder)%31637687;
	return seed;
}
double random::randomReal()
{
	double dseed=randomInterger();
	return dseed/65536.0;
}
double random::between(double low,double high)
{
	return low+(high-low)*randomReal();
}
int random::between(int low, int high)
{
	return low+randomInterger()%(high-low+1);
}
#endif