primality_average_time.cpp

#include <iostream>
#include <ctime>
#include <vector>
#include <functional>

using namespace std;

int L = 100000000;
int R = 100100000;

int C;

bool primality(int64_t a) {
    return true;
}

void test(function<bool(int64_t)> f) {
    int c = 0;
    for(int i = L; i < R; i++)
        c += f(i);
    C = c;
}

double average(function<bool(int64_t)> f, int samplecount) {
    vector<clock_t> end_ticks(samplecount + 1, clock());
    for(int i = 0; i < samplecount; i++) {
        test(f);
        end_ticks[i + 1] = clock();
    }
    for(int i = 0; i < samplecount; i++)
        cout << "test " << i + 1 << " duration : " << (end_ticks[i + 1] - end_ticks[i] + 0.) / CLOCKS_PER_SEC << " s"<< endl;
    cout << "average of " << samplecount << " test(s) : " << (end_ticks[samplecount] - end_ticks[0] + 0.) / (samplecount * CLOCKS_PER_SEC) << " s" << endl;
    return (end_ticks[samplecount] - end_ticks[0] + 0.) / (samplecount * CLOCKS_PER_SEC);
}

#define name(x) (#x)

int main() {
    cout << "primality test using " << name(primality) << "(int64_t)" << endl;
    cout << "L = " << L << " : " << "R = " << R << endl;
    average(primality, 2);
}