Quadratic Formula Solver

[Stokes]

Hey guys, i'm having some trouble executing this .cpp file, I would really appreciate some help in finding my error, here's what i've got:

#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
int main()
{
double a; double b; double c;
double Posx;
double Negx;
cout<<"Enter the coefficient of the quadratic term> ";
cin>>a;
cout<<"Enter the coefficient of the linear term> ";
cin>>b;
cout<<"Enter the constant term> ";
cin>>c;
cout<<endl;
Posx=(-b+sqrt(b*b)-(4*a*c))/(2*a));
Negx=(-b-sqrt(b*b)-(4*a*c))/(2*a));
cout<<"The solution to the equation "
<<setprecision(5)<<fixed<<float(1)<<a<<"x^2+"
<<setprecision(5)<<fixed<<b<<"x+"
<<setprecision(5)<<fixed<<c<<" = 0.00000 is {"
<<setprecision(5)<<fixed<<Posx<<","
<<setprecision(5)<<fixed<<Negx<<"}."
<<endl;
return 0;
}


cout<<setprecision(5);
cout<<"The solution to the equation "<< fixed <<coefa<<"x^2 +
"<<coefb<<"x + "<<coefc<<" = 0.00000 "<<endl;
cout<<"is {"<<positive equation x<<" , "<<negitive equation x<<"}."<<endl;
return 0;
}

[AWH]

Hello, Stokes.

Your issue is caused by the closing brace after the first return statement. Removing that should solve your problem. Also, the second cout statement from the bottom is also causing a problem. Since quotations cannot be spread across multiple lines, the compiler generates a syntax error.

[coolishmike]

I need to do the same thing. Here is what I have written in Visual C++ Express 2010:

#include "stdafx.h"
#include <iostream>
#include <cmath>
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
double quadratic,linear,cons ;
double num1,num2=0;
double power;

cout<<"Enter the coefficient of the quadratic term>";
cin>>quadratic;
cout<<"Enter the coefficient of the linear term>";
cin>>linear;
cout<<"Enter the constant term>";
cin>>cons;

cout << "The solution to the equation" << quadratic << "x^2 +" << linear << "x + " << cons << "= 00.00000";

power=pow (linear / 2 , 2.0);
num1= ( - linear + sqrt(power - ( 4 * quadratic * cons )) ) / (2 * quadratic);
num2= ( - linear - sqrt(power - ( 4 * quadratic * cons )) ) / (2 * quadratic);
cout<<"is {"<<num1<<","<<num2<<"}";

return 0;
}

When I run a debug, I get no errors. However, while running the program, it goes like this:

Enter the coefficient of the quadratic term> *any number*
Enter the coefficient of the linear term> *
Enter the coefficient of the constant term> *

Then the program will shutdown, without displaying an answer...

If you see anything wrong with the code please let me know.

[coolishmike]

Made a few changes.

#include "stdafx.h"
#include <iostream>
#include <cmath>
#include <iomanip>
#include <conio.h>
#include <windows.h>
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
	double quadratic,linear,cons ;
double num1,num2=0;
double power;

cout<<"Enter the coefficient of the quadratic term>";
cin>>quadratic;
cout<<"Enter the coefficient of the linear term>";
cin>>linear;
cout<<"Enter the constant term>";
cin>>cons;

cout << "The solution to the equation " <<setprecision(5)<<fixed<<quadratic << "x^2 + " <<setprecision(5)<<fixed<<linear<< "x + " <<setprecision(5)<<fixed<<cons<<" = 0.00000\n";

power=pow (linear / 2 , 2.0);
num1= ( - linear + sqrt(power - ( 4 * quadratic * cons )) ) / (2 * quadratic);
num2= ( - linear - sqrt(power - ( 4 * quadratic * cons )) ) / (2 * quadratic);
cout<<"is {"<<setprecision(5)<<fixed<<num1<<","<<setprecision(5)<<fixed<<num2<<"}\n";

cout<<"Press any key to exit.";
_getch();

return 0;

}

So here is the program now:

Enter the coefficient of the quadratic term>4
Enter the coefficient of the linear term>5
Enter the constant term>6
The solution to the equation 4.00000x^2 + 5.00000x + 6.00000 = 0.00000
is {-1.#IND0,-1.#IND0}
Press any key to exit.

What is "#IND0" and what is keeping this from calculating the correct answers? I'd seriously appreciate any help you guys can give me!

[AWH]

Hello, coolishmike.

This link may prove useful to you: http://www.johndcook.com/IEEE_exceptions_in_cpp.html