用cpu玩出正弦函数

直接上代码

#include <iostream>
#include <windows.h>
#include <cmath>

#define PI 3.14
using namespace std;

int main()
{
    int starttime;
    int busytime;
    int sinval = 0;
    while(1)
    {
        starttime = GetTickCount();
        busytime = (int)(500 * sin(float((sinval) %= 10) / 10 * 2 * PI)) + 500;
        cout << busytime << endl;
        sinval++;
        while(GetTickCount() - starttime < busytime)
            ;
        Sleep(1000 - busytime);
    }
    return 0;
}