控制CPU使用率,让它画一条弧线

#include<stdio.h>
#include <stdlib.h>
#include<math.h>
#include <dos.h> 
#include "Windows.h"

const double SPLIT=0.01;
const int COUNT=200;
const double PI=3.14159265;
const int INTERVAL=300;
int _tmain()
{
    DWORD busySpan[COUNT];
    DWORD idleSpan[COUNT];
    int half=INTERVAL/2;
    double radian=0.0;
    for(int i=0;i<COUNT;i++)
    {
        busySpan[i]=(DWORD)(half+(sin(PI*radian)*half));
        idleSpan[i]=INTERVAL-busySpan[i];
        radian+=SPLIT;
    }
    DWORD startTime=0;
    int j=0;
    while(true)
    {
        j=j%COUNT;
        startTime=GetTickCount();
        while((GetTickCount()-startTime)<=busySpan[j]);
        Sleep(idleSpan[j]);
        j++;
    }
    return 0;
}

为保测试结果更准确.请运行代码后,不要做其它操作.代码来源<<编程之美>>,效果如下图: