Question

Give examples of a C++ program that allow users to manipulate (adding, removing, sort, etc.) a list of items. To start, you need to propose a problem that you would like to work on and you can't use TO-DO list.

Answer 1

We can take a problem as follows:

Suppose we have to create a list of phone numbers (contacts list) in a phone. Here, we can add numbers, remove numbers and sort numbers.

Given is the solution of the above problem in C++:

#include <bits/stdc++.h>

using namespace std;

int main()
{
    vector <int> numbers;       //we create an empty vector named numbers
    cout<<"Enter the operation you want to perform: "<<endl;
    int c;                      //we declare int c to take input of the operation.
    int x;                      //we declare x to take input of the number.
    int f = 1;                  //we declare f to indicate whether the program has to be ended or not.

    while(f == 1)
    {
        cout<<"(1). Add"<<endl;         //displaying the menu.
        cout<<"(2). Remove"<<endl;
        cout<<"(3). Sort"<<endl;
        cin>>c;
        switch(c)                   //we pass c within the switch case.
        {
            case 1:                 //case in which user wants to add a number.
                cout<<"Enter number to be added: ";
                cin>>x;
                numbers.push_back(x);       //number is pushed back to the list.
                break;
            case 2:                 //case in which user wants to remove a number.
                cout<<"Enter number to be deleted: ";
                cin>>x;
                for(int i=0;i<numbers.size();i++){
                    if(numbers[i]==x)
                    {
                        numbers.erase(numbers.begin()+i);       //number is erased from the position where it is found.
                    }
                }
                break;
            case 3:                 //case in which user wants to sort the list.
                cout<<"The contact list has been sorted. "<<endl;
                sort(numbers.begin(),numbers.end());
                break;
            default:                //deafult case if user does not enter valid number.
                cout<<"Enter valid number.";
        }

        cout<<"Do you want to perform another operation? If yes Enter 1: ";
        cin>>x;                         //taking input in case the user wants to re-run the program.
        if(x==1)
        {
            f = 1;                      //case when the user wants to re-run it.
        }
        else
        {
            f = 0;                      //case when the user wants to end the program.
        }
    }
    return 0;                           //terminating the program.
}

Kindly like if this helps :)