让cpu使用曲线变得有意思-----参考《编程之美》

// contrltask.cpp : 定义控制台应用程序的入口点。



//





#include "stdafx.h"

#include<Windows.h>

#include<stdlib.h>

#include<math.h>



const double INC = 0.01;

const int COUNT = 200;

const int INTERVAL = 200;

const double PI = 3.1415926;





int _tmain(int argc, _TCHAR* argv[])

{

    DWORD busySpan[COUNT];

    DWORD idleSpan[COUNT];

    double radian = 0.0;

    int half = INTERVAL / 2;

    int i;



    for ( i = 0; i < COUNT; i++)

    {

        busySpan[i] = (DWORD) ( half + sin( PI * radian) * half );

        idleSpan[i] = INTERVAL - busySpan[i];

        radian += INC;

    }



    DWORD startTime = 0;

    int j = 0;



    while(true)

    {

        j = j % COUNT;

        startTime = GetTickCount();

        while((GetTickCount() - startTime) <= busySpan[j]);

        Sleep(idleSpan[j]);

        j++;

    }

    return 0;

}