Explain the following code:  #include   using namespace std;    int sum(int(*) (int), int);   int square(int);   int cube(int);    int main()  {      cout << sum(square, 4) << endl;      cout << sum(cube, 4) << endl;  system("pause");  }      int sum(int(*pf) (int k), int n)  {    int s = 0;  for (int i = 1; i <= n; i++)  s = s + (*pf) (i);  return s;  }  int square(int k)  {  return k*k;  }    int cube(int k)  {  return k*k*k;  }

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