// This program turns an LED off when the switch is down, and on when the switch is up.
#include <iostream>
#include <fstream>
	
using namespace std;
	
int main()
	{
		char switch_state;
	
		ifstream button;
		ofstream led;
	
		led.open("/sys/class/gpio/gpio18/value");
	
		//Infinite loop
		while(1)
		{
			/* Although this appears to be bad practice the
			file needs to be reopened so that the state of the
			pin is re-checked. */
			button.open("/sys/class/gpio/gpio23/value");
			if (button.is_open())
			{
				button >> switch_state;
				button.close();
			}
			else
			{
				cout << "Error: could not open file" << endl;
			}
	
			// Debug info
			cout << switch_state << endl;
	
			// Controlling the LED
			if(led.is_open())
			{
				led << switch_state;
				led.flush();
			}
			else
			{
				cout << "Error: could not open file" << endl;
			}
		}
	
		return 0;
	}