Code:
/*

Made by TheEliteOne
Language: C++
HexCalculator Example
Open Source

*/

#include <iostream>
#include <windows.h>
using namespace std;
int main()
{
    system("cls");
    system("title TheEliteOne's HexCalculator");

    int num1, num2;

    cout << "Input a hexadecimal number: 0x";
    cin >> hex >> num1;
    cout << "\nInput a hexadecimal number: 0x";
    cin >> hex >> num2;
    system("cls");

    cout << "0x" << hex << num1 << " + 0x" << hex << num2 << " = 0x" << hex << num1 + num2 << "\n";
    cout << "0x" << hex << num1 << " - 0x" << hex << num2 << " = 0x" << hex << num1 - num2 << "\n";
    cout << "0x" << hex << num1 << " * 0x" << hex << num2 << " = 0x" << hex << num1 * num2 << "\n";
    cout << "0x" << hex << num1 << " / 0x" << hex << num2 << " = 0x" << hex << num1 / num2 << "." << hex << num1 % num2 << "\n\n";

    system("pause");
    return main();
}