team

/*
 * main.cpp
 *
 *  Created on: 17 мая 2020 г.
 *      Author: Fernandez K.A.
 */
#include<iostream>
#include<utility>//connect for map
#include<cmath>//connect for sqrt
using namespace std;
istream& operator >>(istream &inp, pair<int, int> &tmp) { //redefine operator >>
    inp >> tmp.first >> tmp.second;
    return inp;
}
ostream& operator <<(ostream &out, pair<int, int> &tmp) {
    out << tmp.first << tmp.second << '\n';
    return out; //return ostream& from next using cout
}
struct enter { //struct for enter the value of argument's
public:
    pair<int, int> tmp;//pair values of argument's
    enter() {
        cout << "please, enter the value of argument's\n";
    }
    enter(const int &status) {
        if (status != 5) {
            cin >> tmp;//usually situation
        } else {
            int argument;
            cin >> argument;
            tmp.first = tmp.second = argument;//the little magic
        }
    }
    pair<int, int> data() {
        return tmp;//return non-zero pair
    }
};
struct operation {
public:
    int sum(pair<int, int> tmp) {

        return tmp.second + tmp.first;

    }
    int diff(pair<int, int> tmp) {

        return tmp.first - tmp.second;

    }
    int division(pair<int, int> tmp) {
        return tmp.second / tmp.first;
    }
    int mult(pair<int, int> tmp) {
        return tmp.first * tmp.second;
    }
    int sqr(pair<int, int> tmp) {
        return sqrt(tmp.first);
    }
};

struct arg {
public:
    arg() {
        cout << "please, enter the value of argument\n";
    }
    arg(const int &sel) {
        enter cur(sel);
        operation tmp;
        switch (sel) {
        case 1:
            cout << tmp.sum(cur.data()) << endl;
            break;
        case 2:
            cout << tmp.diff(cur.data()) << endl;
            break;
        case 3:
            cout << tmp.division(cur.data()) << endl;
            break;
        case 4:
            cout << tmp.mult(cur.data()) << endl;
            break;
        case 5:
            cout << tmp.sqr(cur.data()) << endl;
            break;
        }
    }

};
int main() {
    int val;
    cout
            << "enter number of operation:\n 1-sum \n 2-differense \n 3-divisions \n 4-multiplication\n 5-sqrt";
    cin >> val;
    arg tmp(val);
    return 0;
}