pitch errors verification for Nowhk, C++ (vc++)

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#include <cmath>
#include <iostream>
#include <iomanip>

const double C0       = 16.352;
const double ln2per12 = std::log(2.) / 12;

// your ref and approx frequency values:
const int      index[] = {46, 623, 954};
const double refFreq[] = {1.33304775683583476286742097727255895733833313, 37.3506591867008808094396954402327537537, 252.719842525523120002617361024022102356};
const double apxFreq[] = {1.33304797524971263555926270782947540283203125, 37.3506628974037084844894707202911376953, 252.719804590087733231484889984130859375};

// ............................................................

void testErrors() {
    using namespace std;
    cout.precision(12);
    const int n = sizeof(index)/sizeof(*index);

cout << "pitch index:    ";
    for (int i = 0; i < n; i++)
        cout << " " << setw(18) << left << index[i];
    cout << endl;

cout << "relative errors:";
    for (int i = 0; i < n; i++)
        cout << " " << abs(refFreq[i] - apxFreq[i]) / refFreq[i];
    cout << endl;

cout << "pitch errors:   ";
    for (int i = 0; i < n; i++)  {
        double a = log(refFreq[i] / C0) / ln2per12;
        double b = log(apxFreq[i] / C0) / ln2per12;
        cout << " " << abs(a - b);
    }
    cout << endl;
}

// ............................................................

int main() {
    testErrors();
    return 0;
}

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Compilation time: 1,91 sec, absolute running time: 10,29 sec, absolute service time: 12,21 sec