classes and semi-colons giving me troubles

[Dalton]

Hey guys, I've got some troubles in this code declaring classes and having the program run due to some errors that all have to do with semicolons. I'm really not that good at C++ so if its something obvious or if i'm just way off, please make the explanation in kind of a layman's terms. Here's my program.

The program is supposed to design a class that can be used that can represent a parabola.

I'll bold what the code is yelling at me for.

#include <iostream>
#include <iomanip>
#include <cmath> 
#include <fstream>
#include <cstdlib>
#include <cstring>

using namespace std;

class Parabola
{
public:
  Parabola( double, double, double );

  double calcDiscrim();
  double calcRoots( double &, double & );
  double calcX();
  double calcY();

  void printEquation();
  void printVertex();
  void printRoots();
  void printConcavity();
  void print();

private:
  double aCoeff, bCoeff, cCoeff;
};

int main()
{
double Coeff, aCoeff, bCoeff, cCoeff, a, b, c ;
string Parabola( double, double, double );


if(a==0)
{
    Coeff = 1;

        aCoeff = a;
    	bCoeff = b;
        cCoeff = c;
	
Parabola p1( 1, 4, -5 );

Parabola p2( 0, 0, 25 );

Parabola p3( -1, 2, -1 );

Parabola p4( -12, -2, 3 );

Parabola p5( 12, 2, 3 );

cout << "The first parabola:" <<  endl;
cout << Parabola p1;

cout << "The second parabola:" << endl;
cout << Parabola p2;

cout << "The third parabola:" << endl;
cout << Parabola p3;

cout << "The fourth parabola:" << endl;
cout << Parabola p4;

cout << "The fifth parabola:" << endl;
cout << Parabola p5;
};
else (a !=0);
{
cout << "error";
}
return 0;
}











double calcDiscrim()
{
	double Coeff, aCoeff, bCoeff, cCoeff;
return( (bCoeff * bCoeff) - (4 * aCoeff * cCoeff) );
}


double calcRoots( double &root1, double &root2)
{
	double Coeff, aCoeff, bCoeff, cCoeff;	
if( calcDiscrim() == 0 )
{
root1 = -bCoeff / ( 2 * aCoeff );

return 1; 
}

if(calcDiscrim()>0)
{
root1 = ( -bCoeff + sqrt( calcDiscrim() ) ) / ( 2 * aCoeff );

root2 = ( -bCoeff + sqrt( calcDiscrim() ) ) / ( 2 * aCoeff );
return 2;
}

if(calcDiscrim()<0)

return 0;

}


 
double calcX()
{
	double Coeff, aCoeff, bCoeff, cCoeff;
return ( -bCoeff / ( 2 * aCoeff ) );
}



double calcY()
{
	double Coeff, aCoeff, bCoeff, cCoeff;
return ( ( aCoeff * calcX() ) + ( bCoeff * calcX() ) + cCoeff );
}


void printEquation()
{
	double Coeff, aCoeff, bCoeff, cCoeff;
cout << aCoeff << "x^2 + " << bCoeff << "x + " << cCoeff << endl;
}


void printVertex()
{
	double Coeff, aCoeff, bCoeff, cCoeff;
cout << "Vertex Coordinates: ("<< calcX() << "," << calcY() <<")" << endl;
}


void printRoots()
{
double number;
double root1, root2;
double &a = root1;
double &b = root2;
number = calcRoots(a, b);

if(number==0)
cout << "There are NO real roots" << endl;

if(number==1)
cout << "There is one real root with X-Coordinate root_1_value" << fixed << setprecision(3) << &a << endl;

if(number==2)
cout << "There are two real roots with X-Coordinate root_1_value" << fixed << setprecision(3) << &a << "and root_2_value" << fixed << setprecision(3) << &b << endl;
}




void printConcavity()
{
double Coeff, aCoeff, bCoeff, cCoeff;	
if(aCoeff < 0)
cout << "The parabola opens Downward" << endl;

else
cout << "The parabola opens Upward" << endl; 
}





void print()
{
printEquation();

printVertex();

printConcavity();

printRoots();
}

[GreyOwl]

cout << "The fifth parabola:" << endl;
cout << Parabola p5;
};
else (a !=0);
{
cout << "error";
}
return 0;
}

the ';' before else denotes the end of a class definition so everything after that is not a part of anything. Also you have a ';' after an else statement which should not be there.

[MiiNiPaa]

First you should delete semicolon at the end of bold area. It creates a dangling else.
Second: All class methods should be defined as

double Parabola::calcDiscrim()
{

And so on...

[AdrianH]

When defining functions outside of the class or namespace scope, you need to qualify the scope that function you are defining is in like doing what MiiNiPaa stated.