Cant subtract??

[humble cedar]

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@red plaza

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@red plaza

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[red plaza]

#include <iostream>
using namespace std;

void calculator() 
{
    while (true)
    {
        string firstNumber;
        string secondNumber;
        string operatorNumber;
        string answer;

        cout << "Enter first number: ";
        cin >> firstNumber;
        cout << "Enter an operator: ";
        cin >> operatorNumber;
        cout << "Enter second number: ";
        cin >> secondNumber;

        if (operatorNumber == "+")
        {
            string answer = firstNumber + secondNumber;
            cout << answer;
        }
        else if (operatorNumber == "-")
        {
            answer = firstNumber - secondNumber;
        }
    }
}

int main()
{
    string enter_calc;

    cout << "Hello there!\nType enter to enter the calculator!" << endl;
    cin >> enter_calc;
    if (enter_calc == "enter")
    {
        while (true) 
        {
            cout << "Enter first number: ";
        }
    }
    else if (enter_calc == "Enter")
    {

    }
}

im lost

!solved