Кукаретики соснулей

// qwe.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "windows.h"

class Timer
{
public:
    void initialize()
    {
        QueryPerformanceFrequency(&qpcFreq);
        invFreq = 1.0 / (double)qpcFreq.QuadPart;
    }
    double time()
    {
        LARGE_INTEGER counter;
        QueryPerformanceCounter(&counter);
        return (double)counter.QuadPart * invFreq;
    }
private:
    LARGE_INTEGER qpcFreq;
    double invFreq;
};

Timer timer = Timer();

int _tmain(int argc, _TCHAR* argv[])
{
    timer.initialize();

    const int N_ELEMS = 1000 * 100500;
    int* arr = new int[N_ELEMS];
    for (int i = 0; i < N_ELEMS; i++)
        arr[i] = 0;

    double time = timer.time();
    for (int i = 0; i < N_ELEMS; i+=1)
        arr[i]++;
    printf("+=1: %lf s\n", timer.time() - time);

    time = timer.time();
    for (int i = 0; i < N_ELEMS; i+=16)
        arr[i]++;
    printf("+=16: %lf s\n", timer.time() - time);

    time = timer.time();
    for (int i = 0; i < N_ELEMS; i+=17)
        arr[i]++;
    printf("+=17: %lf s\n", timer.time() - time);

    delete[] arr;
    return 0;
}