#include <vector>
#include <stdlib.h>
#include <iostream>
#include <chrono>

struct x {
    int a;
    float q, w, e;
};

int main()
{
    const int ITERCOUNT = 100000000;
    auto old = std::chrono::high_resolution_clock::now();
    std::vector<x> testArray(ITERCOUNT, x{ 0,0,0,0 });

    for (int i = 0; i < ITERCOUNT; ++i) {
        testArray[i].a = (rand() % 100) + 1;
    }

    auto t = std::chrono::high_resolution_clock::now();
    std::chrono::duration<double> diff = t - old;
    std::cout << " Start : " << diff.count();
    old = t;

    int sum = 1;
    for (std::vector<x>::iterator it = testArray.begin(); it != testArray.end(); ++it) {
        sum *= it->a;
        sum /= 3;
        sum %= 100;
    }
    t = std::chrono::high_resolution_clock::now();
    diff = t - old;
    std::cout << "\n Test 1 : " << sum << " \t" << diff.count();
    old = t;

    sum = 1;
    for (int i = 0; i < ITERCOUNT; ++i) {
        sum *= testArray[i].a;
        sum /= 3;
        sum %= 100;
    }
    t = std::chrono::high_resolution_clock::now();
    diff = t - old;
    std::cout << "\n Test 2 : " << sum << " \t" << diff.count();
    old = t;

    sum = 1;
    x* pt = &testArray[0];
    x* ptEnd = &testArray[ITERCOUNT - 1];
    int ptSz = &testArray[1] - pt;
    while (pt != ptEnd) {
        sum *= pt->a;
        sum /= 3;
        sum %= 100;
        pt += ptSz;
    }
    sum *= pt->a;
    sum /= 3;
    sum %= 100;

    t = std::chrono::high_resolution_clock::now();
    diff = t - old;
    std::cout << "\n Test 3 : " << sum << " \t" << diff.count();
    old = t;
}