Demonstration of function pointer array in C++

array-of-functions.cpp

#include <iostream>

using namespace std;

int (*functions[4])(int) = {
    [](int x) -> int {
        return x + 10;
    },
    [](int x) -> int {
        return x - 10;
    },
    [](int x) -> int {
        return x * 10;
    },
    [](int x) -> int {
        return x / 10;
    }};

int *map(int *arr, int n, int (*f)(int))
{
    int *new_arr = new int[n];
    for (int i = 0; i < n; i++)
    {
        new_arr[i] = f(arr[i]);
    }
    return new_arr;
}

int main()
{
    int fun;
    int n = 10;
    int offset;
    cout << "Select function: " << endl;
    cin >> fun;
    cout << "Select offset: " << endl;
    cin >> offset;
    int arr[n];
    cout << "Original array: " << endl;
    for (int i = 0; i < n; i++)
    {
        arr[i] = i + offset;
        cout << arr[i] << endl;
    }
    cout << "Mapped array: " << endl;
    int *new_arr = map(arr, n, functions[fun]);
    for (int i = 0; i < n; i++)
    {
        cout << new_arr[i] << endl;
    }

    return 0;
}