#include <iostream.h>
#include <math.h>
#include "apstring.h"

void Solve(double A, double B, double C);
void TestEqu(double A, double B, double C);

void TestEqu(double A, double B, double C)
{
double determent=(B*B)-(4*(A*C));
if(determent<0)
	{
	cout<<"That equation has no real roots, and as such cannot be solved with 'Quad.exe'"<<endl;
	}
else
	Solve(A,B,C);
}

void Solve(double A, double B, double C)
{
	double X1, X2;
	double negB=B*(-1);
	double B2sub4AC=(B*B)-(4*(A*C));
	double twoA=2*A;
	double B2min4AC= sqrt(B2sub4AC);
	X1=(negB+B2min4AC)/(twoA);
	X2=(negB-B2min4AC)/(twoA);
	cout<<"X="<<X1<<" or X="<<X2<<endl<<endl<<endl;
}

int main()
{


char cmd;
double A, B, C;
cout<<"Welcome to Quad.exe, ver 1.2"<<endl<<endl;
cout<<"(C)Jeff Hames 1999"<<endl<<endl;
cout<<"This program will solve the quadratic formula"<<endl;
cout<<"x=(-B +or- square root of (B^2-4AC))/(2A)"<<endl<<endl;

for(;;)
{
	cout<<"Enter Three Numbers (A, B, and C):"<<endl;
	cout<<"A=";
	cin>>A;
	cout<<endl<<"B=";
	cin>>B;
	cout<<endl<<"C=";
	cin>>C;
	cout<<endl;
TestEqu(A,B,C);
	
	cout<<"Would you like to solve another equ? y/n"<<endl;
    cin >> cmd;             // Read one char.
    cin.ignore(80, '\n');   // Skip remaining input (up to 80)

	if(cmd=='n')
		break;
	else if(cmd=='N')
		break;
}	
	cout<<"Thank You for using Quad.exe"<<endl;
}