Task_21.3_new2

#include <iostream>
#include <list>
#include <string>
#include <vector>

using namespace std;

int main() {
    list<double> array;
    vector<list<double>::iterator> oper;
    int command, operation=0;
    cout << "Print command: \n"
//         << "1 - if you want to enter number\n"
//         << "2 - if you want to delete number\n"
         << "3 - if you want to enter number to the end\n"
         << "4 - if you want to delete number from X operation\n"
         << "5 - if you want to print array\n"
         << "0 - if you want to finish program\n";
    cin >> command;
    while(command!=0){
        if(command==3) {
            double num;
            int x=0;
            cout << "Enter number you want to push\n";
            cin >> num;
            array.push_back(num);
            /*auto it = array.begin();
            while(it!=array.end()){
                ++x;
                ++it;
            }
            oper.resize(oper.size()+1);*/
            oper.push_back(--array.end());
            ++operation;
        }
        else if(command==4){
            int X;
            cout << "Enter X\n";
            cin >> X;
            auto it = --array.begin();
            if(X>=oper.size()){
                cout << "ERROR\n";
            }
            else if(oper[X]!=it){
                array.erase(oper[X]);
                oper.push_back(--array.begin());
                ++operation;
            }
            else if(oper[X]==it){
                cout << "ERROR\n";
            }
        }
        else{
            for(auto c:array){
                cout << c << " ";
            }
            cout << "\n";
            oper.push_back(--array.begin());
            ++operation;
        }
        cout << "Print command: \n"
                << "3 - if you want to enter number to the end\n"
                << "4 - if you want to delete number from X operation\n"
                << "5 - if you want to print array\n"
                << "0 - if you want to finish program\n";
        cin >> command;
    }
    return 0;
}