#include <iostream>
#include <iomanip>
#include <cmath>
#include <complex>
using namespace std;
int p(double q, int p = 2) { return p + q; }
void q(int *&p, int *&q) { cout << *p++ << *q-- << " "; }
double p(double r, double p, int q = 1) { return r - q * p; }
int &r(double (*u)(double), int &v, int &w, int &s) {
 cout << setw(5) << v << w << s << endl;
 cout<<"w="<<w<<"::s="<<s<<"\n";
 v = w + s;
  s = v + w;
 cout<<"v="<<v<<"\n";
 cout << w << "!!"<<v << s << endl;
 w = (*u)(w);
 return v;
}
void s(complex<double> q) { cout << q << endl; }
int main() {
 int u[] = {4, 6, 8, 9, 2, 4, 7, 1, 3, 8};
 int *w(&u[3]), *x(u + 1), *y(w + 6);
 s(2); s(complex<double>(2, 2));
 while(x <= y) q(x, y);
 cout << endl << p(3, 2) << " " << p(2, 3, 3.2) << " " << p(2.3)
 << " " << p(3, 2.) << endl;
 r(sqrt, u[2], *u, w[-1]) += 2;
 cout << w[-1] << " " << *u << " " << u[2] << endl;
 return 0;
}