Scientific Calculator

#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;

void displayMenu() {
    cout << "\n=== SCIENTIFIC CALCULATOR ===" << endl;
    cout << "1. Addition" << endl;
    cout << "2. Subtraction" << endl;
    cout << "3. Multiplication" << endl;
    cout << "4. Division" << endl;
    cout << "5. Power" << endl;
    cout << "6. Square Root" << endl;
    cout << "7. Sine" << endl;
    cout << "8. Cosine" << endl;
    cout << "9. Tangent" << endl;
    cout << "10. Logarithm" << endl;
    cout << "11. Exit" << endl;
    cout << "Enter your choice: ";
}

int main() {
    int choice;
    double num1, num2, result;
    
    do {
        displayMenu();
        cin >> choice;
        
        switch(choice) {
            case 1:
                cout << "Enter two numbers: ";
                cin >> num1 >> num2;
                result = num1 + num2;
                cout << "Result: " << result << endl;
                break;
            case 2:
                cout << "Enter two numbers: ";
                cin >> num1 >> num2;
                result = num1 - num2;
                cout << "Result: " << result << endl;
                break;
            case 3:
                cout << "Enter two numbers: ";
                cin >> num1 >> num2;
                result = num1 * num2;
                cout << "Result: " << result << endl;
                break;
            case 4:
                cout << "Enter two numbers: ";
                cin >> num1 >> num2;
                if (num2 != 0) {
                    result = num1 / num2;
                    cout << "Result: " << result << endl;
                } else {
                    cout << "Error: Division by zero!" << endl;
                }
                break;
            case 5:
                cout << "Enter base and exponent: ";
                cin >> num1 >> num2;
                result = pow(num1, num2);
                cout << "Result: " << result << endl;
                break;
            case 6:
                cout << "Enter a number: ";
                cin >> num1;
                if (num1 >= 0) {
                    result = sqrt(num1);
                    cout << "Result: " << result << endl;
                } else {
                    cout << "Error: Cannot find square root of negative number!" << endl;
                }
                break;
            case 7:
                cout << "Enter angle in degrees: ";
                cin >> num1;
                result = sin(num1 * M_PI / 180.0);
                cout << fixed << setprecision(4);
                cout << "Result: " << result << endl;
                break;
            case 8:
                cout << "Enter angle in degrees: ";
                cin >> num1;
                result = cos(num1 * M_PI / 180.0);
                cout << fixed << setprecision(4);
                cout << "Result: " << result << endl;
                break;
            case 9:
                cout << "Enter angle in degrees: ";
                cin >> num1;
                result = tan(num1 * M_PI / 180.0);
                cout << fixed << setprecision(4);
                cout << "Result: " << result << endl;
                break;
            case 10:
                cout << "Enter a number: ";
                cin >> num1;
                if (num1 > 0) {
                    result = log(num1);
                    cout << "Result: " << result << endl;
                } else {
                    cout << "Error: Logarithm undefined for non-positive numbers!" << endl;
                }
                break;
            case 11:
                cout << "Exiting..." << endl;
                break;
            default:
                cout << "Invalid choice!" << endl;
        }
    } while(choice != 11);
    
    return 0;
}