Friend Function Access

#include <iostream>
#include <cstdint>
using namespace std;

class Register8 {
private:
    uint8_t value;
public:
    void setValue(uint8_t v) { value = v; }

    // friend function declaration
    friend void printRegister(const Register8& r);
};

// friend function implementation
void printRegister(const Register8& r) {
    cout << "Register value = " << static_cast<int>(r.value) << endl;
}

int main() {
    Register8 r;
    r.setValue(170);
    printRegister(r);
    return 0;
}