#include #include #include // for rand() #include // for time() using namespace std;

// Function 1: Decimal to Binary string decimalToBinary(int decimal) { if (decimal == 0) return "0"; string binary = ""; while (decimal > 0) { binary = char((decimal % 2) + '0') + binary; decimal /= 2; } return binary; }

// Function 2: Binary to Decimal int binaryToDecimal(string binary) { int decimal = 0; int power = 1; for (int i = binary.length() - 1; i >= 0; i--) { if (binary[i] == '1') { decimal += power; } power *= 2; } return decimal; }

// Function 3: Decimal to Hexadecimal string decimalToHex(int decimal) { if (decimal == 0) return "0"; string hex = ""; char hexDigits[] = "0123456789ABCDEF"; while (decimal > 0) { int remainder = decimal % 16; hex = hexDigits[remainder] + hex; decimal /= 16; } return hex; }

// Function 4: Hexadecimal to Decimal int hexToDecimal(string hex) { int decimal = 0; int power = 1; for (int i = hex.length() - 1; i >= 0; i--) { char c = hex[i]; int value; if (c >= '0' && c <= '9') value = c - '0'; else if (c >= 'A' && c <= 'F') value = c - 'A' + 10; else if (c >= 'a' && c <= 'f') value = c - 'a' + 10; else value = 0; // invalid character decimal += value * power; power *= 16; } return decimal; }

// Menu void menu() { int choice; srand(time(0)); // seed for random numbers

do {
    cout << "\n--- Number Converter Menu ---\n";
    cout << "1. Convert Decimal to Binary\n";
    cout << "2. Convert Binary to Decimal\n";
    cout << "3. Convert Decimal to Hexadecimal\n";
    cout << "4. Convert Hexadecimal to Decimal\n";
    cout << "5. Demo (Random number to Binary)\n";
    cout << "6. Exit\n";
    cout << "Enter your choice (1-6): ";
    cin >> choice;

    if (choice == 1) {
        int num;
        cout << "Enter a decimal number: ";
        cin >> num;
        cout << "Binary: " << decimalToBinary(num) << endl;
    }
    else if (choice == 2) {
        string binaryStr;
        cout << "Enter a binary number: ";
        cin >> binaryStr;
        cout << "Decimal: " << binaryToDecimal(binaryStr) << endl;
    }
    else if (choice == 3) {
        int num;
        cout << "Enter a decimal number: ";
        cin >> num;
        cout << "Hexadecimal: " << decimalToHex(num) << endl;
    }
    else if (choice == 4) {
        string hexStr;
        cout << "Enter a hexadecimal number: ";
        cin >> hexStr;
        cout << "Decimal: " << hexToDecimal(hexStr) << endl;
    }
    else if (choice == 5) {
        int randomNum = rand() % 100; // random number between 0 and 99
        cout << "Random Number: " << randomNum << endl;
        cout << "Binary: " << decimalToBinary(randomNum) << endl;
    }
    else if (choice == 6) {
        cout << "Exiting program. Goodbye!" << endl;
    }
    else {
        cout << "Invalid choice. Please select a number between 1 and 6." << endl;
    }
} while (choice != 6);

}

// Main function int main() { menu(); return 0; }