/*
Lecture notes from Prof. Barimani's class
                            1/2
                       (4AC) - 8
             M = C +  ------------
                          2B

Rule #1) B cannot be zero
Rule #2) AC cannot be negative
*/

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

void formulaM(double A, double B, double C)
{
	double M;
	M = C + (sqrt(4 * A * C) - 8 ) / (2 * B);
	cout<<"M = "<<M<<"\n";
}

int main()
{

	double A, B, C;
	cout<<"Enter values for A, B, and C: ";
	cin>>A>>B>>C;
	if (B == 0)
	{
		cout<<"B cannot be zero\n";
	}
	else
	{
		if (A*C < 0)
		{
			cout<<"AC cannot be zero\n";
		}
		else
		{
			formulaM(A, B, C);
		}
	}
	system("PAUSE");
	return 0;
}