how to build a calculator using c++

// This is for beginners

#include <iostream>

using namespace std;

void greetings() {
    cout << "welcome to the calculator made in c++ :D\n";
}

void instructions() {
    cout << "Here is the operators you can use + - / *\n";
}

int main()
{
    greetings();
    instructions();
    int num1, num2;
    char op;
    int result;
    char again = 'Y';

    while (again == 'y' || again == 'Y') {



        cout << "\nEnter your first digit: ";
        cin >> num1;

        cout << "\nEnter your operator digit: ";
        cin >> op;

        cout << "\nEnter your second digit: ";
        cin >> num2;

        if (op == '+') {
            result = num1 + num2;
        }
        else if (op == '-') {
            result = num1 - num2;
        }
        else if (op == '*') {
            result = num1 * num2;
        }
        else if (op == '/') {
            result = num1 / num2;
        }
        else {
            cout << "Invalid operator";
        }

        cout << "= " << result;
        cout << "\nDo you want to restart the calculator? (Y or N)";
        cin >> again;
    }

    system("pause>0");

    return 0;
}

#include <iostream>

using namespace std;

int main()
{
int num1;
int num2;
char op;
  
  cout << "Enter a number:" << endl;
  cin >> num1; //takes input
  
  cout << "Enter another number:" << endl; //prints some prompt
  cin >> num2;
  
  cout << "Enter a operator:" << endl; //prints some prompt
  cin >> op;
  
  if(op == '+')
  {
  cout << "Result = " << num1 + num2 << endl;
  }else if(op == '-'){
  cout << "Result = " << num1 - num2 << endl;
  }else if(op == '*'){
  cout << "Result = " << num1 * num2 << endl;
  }else if(op == '/'){
  cout << "Result = " << num1 / num2 << endl;
  }
  
  
}