学步园

/*
This is a free Program, You can modify or redistribute it under the terms of GNU
*Description: 给定一定的范围和定时,如给定1000,定时为2s,输出到2s时产生的1000之内的随机数

*Language: C++
*Development Environment: VC6.0
*Author: Wangzhicheng
*E-mail: 2363702560@qq.com
*Date: 
2012/10/6*/

#include <iostream>
#include <ctime>

using namespace std;

class ShowRandom {
private:
	long Rang;   //显示随机数的范围
	int duration;  //持续时间


	void Producer() {   //显示随机数,在持续时间到来时终止
		clock_t start;
		clock_t end;

		int i;
		long n;
		srand(unsigned(time(0)));

		start=clock(); //获取此段代码开始时间
		while(true) {
			n=rand()%Rang;
			cout<<n;
			system("cls");
			for(int i=0;i<10000000;i++) ; //暂停一会
			end=clock();
			if(duration==int(end- start)/CLOCKS_PER_SEC) break;  //计算出持续时间
		}
		cout<<duration<<"秒之后产生的随机数是:"<<n<<endl;
	}
public:
	ShowRandom(long r,double d) {
		setRang(r);
		setDuration(d);
		Producer();
	}
	void setRang(long r) {
		Rang=r;
	}
	long getRang() const {
		return Rang;
	}

	
	void setDuration(int d) {
		duration=d;
	}
	long getDuration() const {
		return duration;
	}
};
void main() {
	ShowRandom(10000,60);
}