#include <iostream>#include <stdlib.h>#include <windows.h>#include <math.h>int main(){    using namespace std;    int time, dt;    float f;    float a = 31.142;    time = GetTickCount();    for (register int i = 0; i < 10000000; ++ i)    {    }    dt = GetTickCount() - time;    cout << "None: " << (float) dt / 10000 << endl;    time = GetTickCount();    for (register int i = 0; i < 10000000; ++ i)    {        f = sin(a);    }    dt = GetTickCount() - time;    cout << "Sin: " << (float) dt / 10000 << endl;    time = GetTickCount();    for (register int i = 0; i < 10000000; ++ i)    {        f = cos(a);    }    dt = GetTickCount() - time;    cout << "Cos: " << (float) dt / 10000 << endl;    system("pause");}