#include <iostream>
#include <iomanip>

using namespace std;

double doubler(const int x);
double squarer(const int x);

void print_table(double (*f)(int));

int main()
{
    cout << "Calls to function doubler:" << endl;
    print_table(doubler);

    cout << endl;
    cout << "Calls to function squarer:" << endl;
    print_table(squarer);

    return 0;
}

double doubler(const int x) { return x+x; }
double squarer(const int x) { return x*x; }

void print_table(double (*f)(int))
{
    for (int i = 1; i <= 5; i++)
    {
        cout << setw(2) << i << setw(3) << (*f)(i) << endl;
    }
}