I have a solution for interfacing C++. It does assume Linux. It should work with Mac OSX as well as OSX is Linux deep down. That is what I have to test with. It will get inputs from the Arduino for the program. I must warn you that not all inputs it can get are valid inputs. Since the Arduino is feeding in characters, it is possible that the last read before a pause is incomplete and the first read after a pause is the rest of that number. Given this, it would be advisable to send in data in it's most compact state and then let the computer crunch numbers. The output stream works in a very similar manner and the Arduino needs to programmed in a manner that is aware of this.

#include<iostream>
#include<fstream>
#include<cstdlib>
using namespace std;

int main()
{

	system("stty -F /dev/ttyACM0 cs8 9600 ignbrk -brkint -icrnl -imaxbel
-opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke
noflsh -ixon -crtscts");	//Activates the tty connection with the Arduino
	ifstream Arduino_Input("/dev/ttyACM0");
//Opens the tty connection as an ifstream
	ofstream Arduino_Output("/dev/ttyACM0");
//Opens the tty connection as an ofstream, not used in this example
	double Voltage;	//The Arduino is reading the voltage from A0
	long int Time = time(NULL);
	int i;

	while(time(NULL)-Time < 5){}	//Wait five seconds for the Arduino
to start up
	for(i = 0; i < 100;)
	{
		Time = time(NULL);
		while(time(NULL)-Time < 1){}	//wait one second to get
good numbers into the Arduino stream
		while(!Arduino_Input.eof())	//while the eof flage isn't set
		{
			Arduino_Input >> Voltage;	//will set the
error flag if not ready, will get a number from the Arduino stream if ready
			cout << Voltage << endl;	//Output it to the cout
stream
			i++;	//Increament i, it is not known how many numbers
I'll get at a time
		}
		Arduino_Input.clear();	//eof flag won't clear itself
	}

	Arduino_Input.close();	//Close the ifstream
	return(0);

}