Test pow

#define _CRT_SECURE_NO_WARNINGS
#define Inf 1000*1000*1000
#include <iostream>
#include <chrono>
#include <ctime>
#include <cmath>
using namespace std;
using namespace chrono;

int main() {
    srand(static_cast<unsigned int>(time(0)));
    double val;
    time_point<high_resolution_clock> start, end;
    start = high_resolution_clock::now();
    for (int i = 0; i < Inf; i++) {
        val = (double)rand() / RAND_MAX;
        val = val * val;
    }
    end = high_resolution_clock::now();
    duration<int64_t, nano> dur_ns = (end - start);
    unsigned long long elapsed_seconds = dur_ns.count();
    cout << "val*val: " << elapsed_seconds << endl;

    start = high_resolution_clock::now();
    for (int i = 0; i < Inf; i++) {
        val = (double)rand() / RAND_MAX;
        val = val * val;
    }
    end = high_resolution_clock::now();
    dur_ns = (end - start);
    elapsed_seconds = dur_ns.count();
    cout << "*=val: " << elapsed_seconds << endl;

    start = high_resolution_clock::now();
    for (int i = 0; i < Inf; i++) {
        val = (double)rand() / RAND_MAX;
        val = pow(val, 2);
    }
    end = high_resolution_clock::now();
    dur_ns = (end - start);
    elapsed_seconds = dur_ns.count();
    cout << "pow: " << elapsed_seconds << endl;
    return 0;
}