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Exceptions Classes for Zero and Negitive

NateE (25)
Receiving errors and I am not sure why. I am attempting to add exception files for zero and negative. My program was working until I attempted to add these files. The error: expected class-name before '{' token|, has me really scratching my head.

||=== Build: Debug in Final Area (compiler: GNU GCC Compiler) ===|
NegativeException.h|8|error: expected class-name before '{' token|
NegativeException.h|10|error: 'string' does not name a type|
NegativeException.h|12|error: expected ')' before '_msg'|
NegativeException.h||In member function 'virtual const char* NegativeException::what() const':|
NegativeException.h|19|error: 'msg' was not declared in this scope|
ZeroException.h|6|error: expected class-name before '{' token|
ZeroException.h|8|error: 'string' does not name a type|
ZeroException.h|10|error: expected ')' before '_msg'|
ZeroException.h||In member function 'virtual const char* ZeroException::what() const':|
ZeroException.h|17|error: 'msg' was not declared in this scope|
Circle.cpp|18|error: expected unqualified-id before '{' token|
||=== Build failed: 9 error(s), 0 warning(s) (0 minute(s), 0 second(s)) ===|


Last edited on
NateE (25)
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#include <iostream>
#include <string>
#include "Circle.h"  //Defines Circle
#include "Square.h"  //Defines Square
#include "Rectangle.h" //Defines Rectangle



int main()
{   // Start main function
using namespace std;

 areaChoice = 0;
 int menuOption;



		if(areaChoice > 3)
            {
			cout<<"You did not enter a valid option"<<endl;
			cout<<"Please re-enter a valid option, 1, 2 or 3: ";
			cin>>areaChoice;
			cout<<endl;
            }

	  else if (areaChoice <=3)
            {
			cout<<"Thank you for your entry."<<endl;
            }


    //Array requires user to select 1 for Circle or 2 for Square 3 for Rectangle
    do
    { // Starting of while loop
       cout << endl << "_______________Calculate Area______________" << endl;
       cout << "Select an Object" << endl;
       cout << " 1: Circle" << endl;
       cout << " 2: Square" << endl;
       cout << " 3: Rectangle" <<endl;
       cout << " 0: Exit" << endl;
       cout << " Enter Your Choice: ";
       cin  >> menuOption;


      switch(menuOption)

{

case 1:
{
    double radius;
    cout << "Enter the radius in inches. ";
    cin >> radius;
    string name = "myCircle";
    string unit = "in";
    Circle C(name, radius, unit);
    cout << "The area of the circle is " << C.getArea() << " inches." << endl;
    break;
}

case 2:
{
    double length;
    cout << "Enter the length of one side in inches. ";
    cin >> length;
    string name = "mySquare";
    string unit = "in";
    Square S(name,length,unit);
    cout << "The area of the square is " << S.getArea() << " inches." << endl;
    break;
}

case 3:

    {
    double length;
    double width;

        cout << "Enter the length of one side in inches. ";
        cin >> length;
        cout << "Enter the width of one side in inches. ";
        cin >> width;
        string name = "myRectangle";
        string unit = "in";
        Rectangle R(name,length, width, unit);
        cout << "The area of the rectangle is " << R.getArea() << " inches." << endl;
    }
}


}
   while(menuOption!=0);

   cout<<" ________________ THANK YOU _______________" <<endl;

    return 0;
}   // This ends the main function
ar2007 (210)
are you sure you have not missed any brackets?
NateE (25)
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#ifndef CIRCLE_H_INCLUDED
#define CIRCLE_H_INCLUDED
#include "Shape.h"

class Circle : public Shape      //Class Circle inherits from Base Class Shape
{
//Member declarations
    private:

        double radius;

// Constructors
    public:

        Circle(std::string &, double, std::string &);

// Parent Virtual function

        double getArea() const;

//Function prototypes

        double getRadius();     //Get the Radius (getter)
        void setRadius(double);   //Sets Radius (setter)
};



#endif // CIRCLE_H_INCLUDED


#include "Circle.h"
#include "NegativeException.h"
#include "ZeroException.h"

using namespace std;

const double PI = 3.14159;

//Set radius
 Circle::Circle (string &name, double r, string &unit) :
    Shape(name, "Circle", unit)
    {
        radius = r;
    }



{
	try
	{
		cout<<"Enter the circle's radius: ";
		cin>>radius;
		if (radius < 0)
		{
			throw NegativeException("ERROR: Negative number entered.");
		}
		else if (radius == 0)
			throw ZeroException("ERROR: Zero entered");

	}
	catch (ZeroException ze)
	{
		radius = 0;
		cout << ze.what();
	}
	catch(NegativeException ne)
	{
		radius = 0;
		cout << ne.what();
	}

}

//calculate area

    double Circle::getRadius() { return radius; }

    double Circle::getArea() const
    {
        return (PI * (radius * radius));
    }

    void Circle::setRadius(double r) { radius = r; }


#include "Square.h"
#include "NegativeException.h"
#include "ZeroException.h"

using namespace std;

//Set length
Square::Square(string &name, double len, string &unit) :
    Shape(name, "Square", unit)
    {
        length = len;
    }

//Calculate Area
    double Square::getArea() const
    {
        return length * length;
    }

{
	try
	{
		cout<<"Enter Square length: ";
		cin>>length;
		if (length < 0 )
			throw NegativeException("ERROR: Negative number entered.");
		else if (length == 0)
			throw ZeroException("ERROR: Zero entered");

	}
	catch (ZeroException ze)
	{
		length = 0;
		cout << ze.what();
	}
	catch(NegativeException ne)
	{
		length = 0;
		cout << ne.what();
	}

}

    double Square::getLength() const { return length; }

    void Square::setLength(double len){ length = len; }

#ifndef SQUARE_H_INCLUDED
#define SQUARE_H_INCLUDED
#include "Shape.h"

class Square : public Shape   //Class Square inherits from Base Class Shape
{

//Member declarations
    private:

        double length;

//Constructors

    public:

        Square(std::string &, double, std::string &);

//Parent Virtual function

        double getArea() const;

//Function prototypes

        double getLength() const;     //Get length (getter)
        void setLength(double);      //Set length (setter)
};

#endif // SQUARE_H_INCLUDED


#include "Rectangle.h"
#include "NegativeException.h"
#include "ZeroException.h"

using namespace std;

//Set length, width
Rectangle::Rectangle(string &name, double len, double wid, string &unit) :
    Shape(name, "Rectangle", unit)
    {
        length = len;
        width = wid;
    }

try
	{
		cout<<"Enter Rectangle length: ";
		cin>>length;
		cout<<"Enter Rectangle width: ";
		cin>>width;
		if (length < 0 || width < 0)
			throw NegativeException("ERROR: Negative number entered.");
		else if (length == 0 || width == 0)
			throw ZeroException("ERROR: Zero entered");

	}
	catch (ZeroException ze)
	{
		length = 0;
		width = 0;
		cout << ze.what();
	}
	catch(NegativeException ne)
	{
		length = 0;
		width = 0;
		cout << ne.what();
	}

}
//Calculate Area
    double Rectangle::getArea() const
    {
        return length * width;
    }

    double Rectangle::getLength() const { return length;}
    double Rectangle::getWidth() const {return width;}

    void Rectangle::setLength(double len) { length = len;}
    void Rectangle::setWidth(double wid) {width = wid;}
NateE (25)
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#ifndef RECTANGLE_H_INCLUDED
#define RECTANGLE_H_INCLUDED
#include "Shape.h"

class Rectangle : public Shape      //Class Rectangle inherits from Base Class Shape
{
//Member declarations
    private:

        double length;
        double width;

//Constructors

    public:

        Rectangle(std::string &, double,double, std::string &);

// Parent Virtual function

    double getArea() const;

//Function prototypes

    double getLength() const; //Get length
    double getWidth() const; //Get width

    void setLength(double); //Set length
    void setWidth(double); //Set width
};




#endif // RECTANGLE_H_INCLUDED


#include "Shape.h"
#include <string>

Shape::Shape() {}

Shape::Shape(std::string &name, const std::string &shape, std::string &unit)
{
    shapeID = name;
    shapeName = shape;
    unitOfMeasure = unit;
}
    std::string Shape::getShapeID() const
    { return shapeID; }

    std::string Shape::getShapeName() const
    { return shapeName; }

    std::string Shape::getUnitOfMeasure() const
    { return unitOfMeasure; }

    void Shape::setShapeID(std::string &name)
    { shapeID = name; }

    void Shape::setShapeName(std::string &shape)
    { shapeName = shape; }

    void Shape::setUnitOfMeasure(std::string &unit)
    { unitOfMeasure = unit; }


#ifndef SHAPE_H_INCLUDED
#define SHAPE_H_INCLUDED
#include <string>

class Shape        //Class Name
{

//Member declarations
    private:

        std::string shapeID;        //name of instance
        std::string shapeName;      //Circle, Square, Rectangle
        std::string unitOfMeasure;  //Centimeters or Inches

//Member prototypes
    public:

        Shape();

// derived class constructor will pass a constant string to the base class' constructor.

        Shape(std::string &, const std::string &, std::string &);

//The "get" functions will not allowed to modify any variables in the class.

        std::string getShapeID() const;
        std::string getShapeName() const;
        std::string getUnitOfMeasure() const;

//Each derived class must provide its own getArea().

        virtual double getArea() const = 0;

        void setShapeID(std::string &);
        void setShapeName(std::string &);
        void setUnitOfMeasure(std::string&);
        void print();           //Prints the information
};

#endif // SHAPE_H_INCLUDED


#include <exception>
#include <string>
#ifndef ZeroException_H
#define ZeroException_H

class ZeroException: public exception
{
	private:
		string msg;
public:
		ZeroException(string _msg)
	{
		msg=_msg;
	}

	  virtual const char* what() const throw()
	  {
		return msg.c_str();
	  }
};


#endif


#include <exception>
#include <string>
#ifndef NEGATIVEEXCEPTION_H_INCLUDED
#define NEGATIVEEXCEPTION_H_INCLUDED

class NegativeException: public exception

{
	private:
	string msg;
public:
	NegativeException(string _msg)
	{
		msg=_msg;
	}

	  virtual const char* what() const throw()
	  {
		return msg.c_str();
	  }
} ;


#endif // NEGITIVEEXCEPTION_H_INCLUDED
ar2007 (210)
on your last message:
possible
line 49 open '{' ;
line 73 close '}' ;

inside an exception it has been defined "try - catch" .. but what member function ?

the same on line 106 and 128 and the same on line 179 and 204
Last edited on
NateE (25)
Member function... hmm I tried void Square:: getArea(). Not working
NateE (25)
I am still having issues with adding the exception classes to my program. Not sure why all these errors are coming up. I don't know where to look.

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#include <iostream>
#include <string>
#include "Circle.h"  //Defines Circle
#include "Square.h"  //Defines Square
#include "Rectangle.h" //Defines Rectangle
#include "Shape.h"
#include "NegativeException.h"
#include "ZeroException.h"


int main()
{   // Start main function
using namespace std;

 int areaChoice;
 int menuOption;

    while(areaChoice >3)
    {
    cout<<"You didn't enter a valid option"<<endl;
    cout<<"Please re-enter a valid option, 1, 2 or 3: ";
    cin>>areaChoice;
    cout<<endl;
    }



        //Array requires user to select 1 for Circle or 2 for Square 3 for Rectangle
        do
        { // Starting of while loop
           cout << endl << "_______________Calculate Area______________" << endl;
           cout << "Select an Object" << endl;
           cout << " 1: Circle" << endl;
           cout << " 2: Square" << endl;
           cout << " 3: Rectangle" <<endl;
           cout << " 0: Exit" << endl;
           cout << " Enter Your Choice: ";
           cin  >> menuOption;
        }

        while(areaChoice >3);

      Shape *shape;    //Expression: Shape base class
      switch(menuOption)
        {

        case 1:
        {
            double radius;
            shape->getInput();   //Get user input
            cout << "Enter the radius in inches. ";
            cin >> radius;
            string name = "myCircle";
            string unit = "in";
            Circle C(name, radius, unit);
            cout << "The area of the circle is " << C.getArea() << " inches." << endl;
            break;
        }

        case 2:
        {
            double length;
            shape->getInput();   //Get user input
            cout << "Enter the length of one side in inches. ";
            cin >> length;
            string name = "mySquare";
            string unit = "in";
            Square S(name,length,unit);
            cout << "The area of the square is " << S.getArea() << " inches." << endl;
            break;
        }

        case 3:

            {
            double length;
            double width;
            shape->getInput();   //Get user input
            cout << "Enter the length of one side in inches. ";
            cin >> length;
            cout << "Enter the width of one side in inches. ";
            cin >> width;
            string name = "myRectangle";
            string unit = "in";
            Rectangle R(name,length, width, unit);
            cout << "The area of the rectangle is " << R.getArea() << " inches." << endl;
            }
}//switch



   while(menuOption!=0);

   cout<<" ________________ THANK YOU _______________" <<endl;

    return 0;
}   // This ends the main function


//Rectangle.cpp

#include <iostream>
#include <string>
#include "Circle.h"  //Defines Circle
#include "Square.h"  //Defines Square
#include "Rectangle.h" //Defines Rectangle
#include "Shape.h"
#include "NegativeException.h"
#include "ZeroException.h"


//Main Rectangle Function Call
Rectangle::Rectangle()
{
	width = 0;
	height = 0;
	setShapeType("Rectangle");
}

//Obtain User Input
void Rectangle::getInput()
{


	try
	{
		cout<<"Enter Rectangle height: ";
		cin>>height;
		cout<<"Enter Rectangle width: ";
		cin>>width;
		if (height < 0 || width < 0)
			throw NegativeException("ERROR: Negative number entered.");
		else if (height == 0 || width == 0)
			throw ZeroException("ERROR: Zero entered");

	}
	catch (ZeroException ze)
	{
		height = 0;
		width = 0;
		cout << ze.what();
	}
	catch(NegativeException ne)
	{
		height = 0;
		width = 0;
		cout << ne.what();
	}

}

//Area calculated for Rectangle based on User Input
double Rectangle::area()
{
	return width * height;
}


//Rectangle.h

#ifndef RECTANGLE_H_INCLUDED
#define RECTANGLE_H_INCLUDED
#include "Shape.h"

class Rectangle : public Shape      //Class Rectangle inherits from Base Class Shape
{
//Member declarations
    private:

        double length;
        double width;

//Constructors

    public:

        Rectangle(std::string &, double,double, std::string &);

// Parent Virtual function

    double getArea() const;
    void getInput();
//Function prototypes

    double getLength() const; //Get length
    double getWidth() const; //Get width

    void setLength(double); //Set length
    void setWidth(double); //Set width
};




#endif // RECTANGLE_H_INCLUDED

NateE (25)
Errors

||=== Build: Debug in Final Area (compiler: GNU GCC Compiler) ===|
main.cpp||In function 'int main()':|
main.cpp|50|warning: 'shape' may be used uninitialized in this function [-Wmaybe-uninitialized]|
Rectangle.cpp|12|error: prototype for 'Rectangle::Rectangle()' does not match any in class 'Rectangle'|
Rectangle.h|5|error: candidates are: Rectangle::Rectangle(Rectangle&&)|
Rectangle.h|5|error: Rectangle::Rectangle(const Rectangle&)|
Rectangle.h|17|error: Rectangle::Rectangle(std::string&, double, double, std::string&)|
Rectangle.cpp||In member function 'virtual void Rectangle::getInput()':|
Rectangle.cpp|26|error: 'cout' was not declared in this scope|
Rectangle.cpp|26|note: suggested alternative:|
C:\Program Files (x86)\CodeBlocks\MinGW\lib\gcc\mingw32\4.9.2\include\c++\iostream|61|note: 'std::cout'|
Rectangle.cpp|27|error: 'cin' was not declared in this scope|
Rectangle.cpp|27|note: suggested alternative:|
C:\Program Files (x86)\CodeBlocks\MinGW\lib\gcc\mingw32\4.9.2\include\c++\iostream|60|note: 'std::cin'|
Rectangle.cpp|27|error: 'height' was not declared in this scope|
Rectangle.cpp|38|error: 'height' was not declared in this scope|
Rectangle.cpp|40|error: 'cout' was not declared in this scope|
Rectangle.cpp|40|note: suggested alternative:|
C:\Program Files (x86)\CodeBlocks\MinGW\lib\gcc\mingw32\4.9.2\include\c++\iostream|61|note: 'std::cout'|
Rectangle.cpp|44|error: 'height' was not declared in this scope|
Rectangle.cpp|46|error: 'cout' was not declared in this scope|
Rectangle.cpp|46|note: suggested alternative:|
C:\Program Files (x86)\CodeBlocks\MinGW\lib\gcc\mingw32\4.9.2\include\c++\iostream|61|note: 'std::cout'|
Rectangle.cpp|52|error: no 'double Rectangle::area()' member function declared in class 'Rectangle'|
||=== Build failed: 12 error(s), 1 warning(s) (0 minute(s), 1 second(s)) ===|
ar2007 (210)
1-insert: Rectangle(); on Rectangle.h
2-insert: using namespace std; on Rectangle.cpp
3-insert: data member private 'heigth' on class Rectangle , on Rectangle.h
4-insert: member function area on class Rectangle , in Rectangle.h
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