A calculator exercise in C++ using enum classes/scoped enums, structs, and member functions

calc.cpp

#include <iostream>

enum class Operation { Add, Subtract, Multiply, Divide };

struct Calculator {
    Operation op;
    Calculator(Operation operation) { op = operation; }

    int calculate(int a, int b) {
        switch (op) {
            case Operation::Add: {
                return a + b;
            } break;
            case Operation::Subtract: {
                return a - b;
            } break;
            case Operation::Multiply: {
                return a * b;
            } break;
            case Operation::Divide: {
                return a / b;
            } break;
            default: {
                std::cout << "Error: invalid operation!\n";
                return 0;
            }
        }
    }
};

int main() {
    int num1, num2;
    std::string operation;
    std::cout << "Please provide an integer.\n";
    std::cin >> num1;
    std::cout << "Please provide another integer.\n";
    std::cin >> num2;
    std::cout << "What type of operation do you want to perform? (Add, Subtract, Multiply, Divide)\n";
    std::cin >> operation;

    Operation op{};

    if (operation == "Add") {
        op = Operation::Add;
    } else if (operation == "Subtract") {
        op = Operation::Subtract;
    } else if (operation == "Multiply") {
        op = Operation::Multiply;
    } else if (operation == "Divide") {
        op = Operation::Divide;
    }

    Calculator calc(op);
    auto answer = calc.calculate(num1, num2);
    std::cout << answer << "\n";
}