Function Pointer

#include <iostream>

using namespace std;

void mapInt(int (*func)(int), int a[], int n)
{
    for (int i = 0; i < n; i++)
    {
        a[i] = func(a[i]);
    }
}

int doubleInt(int x)
{
    return x * 2;
}

int main()
{
    int a[5] = {1,2,3,4,5};

    mapInt(doubleInt, a, 5);

    for (int i = 0; i < 5; i++)
        cout << a[i] << " ";
    cout << endl;

    return 0;
}