Help with pass by reference quadratic program

[jon smith]

I need help finishing my program that uses pass by reference and will output all the roots of a quadratic after the user inputs the coefficients (a, b, c). I know there are probably a few errors, but i am stuck and don't know what to do from here. anyone?

  #include <cmath>
#include <iomanip>
#include <iostream>

using namespace std;

double quad(double&,double&,double&);

int main()
{
	double a;
	double b;
	double c;
	double x1;
	double x2;
	char choice = 'y';






	cout <<"This program will find the roots of a quadratic"<<endl<<endl;

	do{

	cout <<"Please input the values for the coefficients; a, b, c""(y=ax^2+bx+c)"<<endl<<endl;
cin>>a>>b>>c;

if((b * b - 4 * a * c) > 0)
quad(a,b,c);
cout <<"The positive roots are "<<x1<<endl<<endl;

if else ((b * b - 4 * a * c) = 0);
quad(a,b,c);

if else ((b * b - 4 * a * c) < 0);
quad (a,b,c);
cout <<"The negative roots are "<<x2<<endl<<endl;


system ("cls");

cout <<"Would you like to run this again? y or Y for yes, anything else for no"<<endl<<endl;
	
	}while (choice =='y' || choice =='Y');

	system ("Pause");
	return 0;

}


double quad(double&a, double&b, double&c)
{
	x1 = (-b+sqrt(b*b-4*a*c))/(2*a);
	x2 = (-b-sqrt(b*b-4*a*c))/(2*a);



	return;

}

[jon smith]

sorry, but can anyone help me plz?

[rodiongork]

If you want help, you'd better compose yourself and tell exactly at which issue you stuck. "I have written something... and I do not know what write further..." always look at least strange and people really could not understand what to do to help you.

[Michael37]

"I know there are probably a few errors, . . ."

You think there are a few errors?! It sounds like you are not sure.

Have you compiled and run this program?

Let's deal with one error at a time. What are the specific errors?

[jon smith]

I fixed some of them, but i need help putting my imaginary roots into the form of A+Bi and A-Bi. This is what i have so far:

#include <cmath>
#include <iomanip>
#include <iostream>

using namespace std;

void quad(double&,double&,double&,double&,double&);

int main()
{
	double a;
	double b;
	double c;
	double x1;
	double x2;
	char choice = 'y';






	cout <<"This program will find the roots of a quadratic"<<endl<<endl;

	do{

	cout <<"Please input the values for the coefficients; a, b, c"" (y=ax^2+bx+c)"<<endl<<endl;
cin>>a>>b>>c;

if (a==0)
{ cout <<"If a is 0, then it is a line. Can't divide by 0"<<endl<<endl;
}
else
{
quad(a,b,c,x1,x2);
if((b * b - (4 * a * c)) < 0)
{
cout<<"the imaginary root(s): "<<setw(5)<<fixed<<setprecision(3)<<x1<<"\t"<<x2<<endl<<endl;

}
else  
{
cout<<"the real root(s): "<<setw(5)<<fixed<<setprecision(3)<<x1<<"\t"<<x2<<endl<<endl;

}

}


cout <<"Would you like to run this again? y or Y for yes, anything else for no"<<endl<<endl;
cin >>choice;	

	}while (choice =='y' || choice =='Y');

	system ("Pause");
	return 0;

}


void quad(double&a, double&b, double&c, double&x1, double&x2)
{
	

	x1 = (-b+sqrt((b*b)-4*a*c))/(2*a);
	x2 = (-b-sqrt((b*b)-4*a*c))/(2*a);




}