16. Object Declaration and Function Access

#include <iostream>
using namespace std;

class LED {
public:
    void turnOn()  { cout << "LED ON\n"; }
    void turnOff() { cout << "LED OFF\n"; }
};

int main() {
    LED led;
    led.turnOn();
    led.turnOff();
    return 0;
}

Solution Explanation

• The LED class has two public functions.
• The object led is declared in main().
• Using led.turnOn() and led.turnOff(), the program prints both lines.
  
   

Layman’s Terms

The object is like a remote control. You press one button (turnOn) and it prints "LED ON". Press another (turnOff) and it prints "LED OFF".

Significance for Embedded Developers

This is exactly how you’d model GPIO control in firmware: you call high-level functions (turnOn(), turnOff()) instead of manually writing to registers.