Basic_Operations.cpp

#include<iostream>
using namespace std;

void menu();
int add(int y, int z);
int sub(int y, int z);
int mult(int y, int z);
float divide(float y, float z);
int modulo(int y);

int main() {
    int y, z, choice, sum, diff, prod, mod;
    float quot;
    char do_again;

    do {
        menu();
        cin >> choice;

        switch(choice) {
            case 1:
                cout << "Addition\n";
                cout << "Enter y: ";
                cin >> y;
                cout << "Enter z: ";
                cin >> z;
                sum = add(y, z);
                cout << "Sum: " << sum << endl;
                break;

            case 2:
                cout << "Subtraction\n";
                cout << "Enter y: ";
                cin >> y;
                cout << "Enter z: ";
                cin >> z;
                diff = sub(y, z);
                cout << "Difference: " << diff << endl;
                break;

            case 3:
                cout << "Multiplication\n";
                cout << "Enter y: ";
                cin >> y;
                cout << "Enter z: ";
                cin >> z;
                prod = mult(y, z);
                cout << "Product: " << prod << endl;
                break;

            case 4:
                cout << "Division\n";
                cout << "Enter y: ";
                cin >> y;
                quot = divide(y, z);
                cout << "The quotient is: " << quot << endl;
                break;

            case 5:
                cout << "Modulo\n";
                cout << "Enter y: ";
                cin >> y;
                mod = modulo(y);
                cout << "The result is: " << mod << endl;
                break;

            case 6:
                cout << "Farewell to you, my friend!" << endl;
                break;

            default:
                cout << "Invalid Choice" << endl;
                return 0;
        }

        cout << "Press [1] if you want another choice, [0] if you want to exit" << endl;
        cin >> do_again;

        if (do_again == '1') {
            system("CLS");
            main();
            return 0;
        } else {
            cout << "You choose to exit" << endl;
            return 0;
        }
    } while (do_again != '0');
}

void menu() {
    cout << "[1] Add" << endl;
    cout << "[2] Sub" << endl;
    cout << "[3] Mult" << endl;
    cout << "[4] Div" << endl;
    cout << "[5] Modulo" << endl;
    cout << "[6] Exit" << endl;
    cout << "Enter your choice (1-6): ";
}

int add(int a, int b) {
    return a + b;
}

int sub(int a, int b) {
    return a - b;
}

int mult(int a, int b) {
    return a * b;
}

float divide(float a, float b) {
    return a / b;
}

int modulo(int a) {
    return a % 10;
}