I'm trying to get a class working to represent complex numbers. I'm trying to derive everything from a base class, Number, and I make two inherited classes from it, Real and Complex. I'm trying to put virtual functions in the Number base class so that I can implement them in the derived classes.
The problem is, when I go to build an instance of a class, I get the following error messages:
Error 2 error LNK1120: 1 unresolved externals Error 1 error LNK2019: unresolved external symbol "public: __thiscall Real::~Real(void)" (??1Real@@QAE@XZ) referenced in function _wmain
I've checked and I've seen that errors 1120 & 2019 can appear when your project linker subsystem is set to Windows instead of Console, but I've already made it as a Console Application. The errors above appear below when I try to create an instance of class Real. Thanks for any help.
#include "stdafx.h"
#include <iostream>
#include <math.h>
#define PI 3.14159
class Number
{
public:
virtual void Add(double value) { std::cout << "Add Numbers" << std::endl; }
virtual void Sub(double value) { std::cout << "Subtract Numbers" << std::endl; }
virtual void Mult(double value) { std::cout << "Multiply Numbers" << std::endl; }
virtual void Div(double value) { std::cout << "Divide Numbers" << std::endl; }
virtual void SetVal(double value) { std::cout << "Set Number Value" << std::endl; }
virtual void PrintVal() { std::cout << "Print Number Value" << std::endl; }
};
class Real : public Number
{
private:
double real;
public:
Real(double value)
{
Real::real = value;
}
~Real();
void Add(double value)
{
real += value;
}
void Sub(double value)
{
real -= value;
}
void Mult(double value)
{
real *= value;
}
void Div(double value)
{
real /= value;
}
void SetVal(double value)
{
real = value;
}
void PrintVal()
{
std::cout << "Number = " << real << std::endl;
}
};
class Complex : public Number
{
private:
double real;
double complex;
double FindAngle(double real, double complex)
{
if (real == 0 && complex > 0)
return 0;
else if (real == 0 && complex < 0)
return PI;
else if (real > 0 && complex == 0)
return PI / 2;
else if (real < 0 && complex == 0)
return 3 * PI / 2;
else
return atan2(complex, real);
}
public:
Complex(double val1, double val2)
{
real = val1;
complex = val2;
}
~Complex();
void Add(double val1, double val2)
{
real += val1;
complex += val2;
}
void Sub(double val1, double val2)
{
real -= val1;
complex -= val2;
}
void Mult(double val1, double val2)
{
double abs1, abs2, angle1, angle2;
double absFinal, angleFinal;
abs1 = sqrt(real*real + complex*complex);
abs2 = sqrt(val1*val1 + val2 + val2);
angle1 = FindAngle(complex, real);
angle2 = FindAngle(val2, val1);
absFinal = abs1 * abs2;
angleFinal = angle1 + angle2;
real = absFinal * cos(angleFinal);
complex = absFinal * sin(angleFinal);
}
void Div(double val1, double val2)
{
double abs1, abs2, angle1, angle2;
double absFinal, angleFinal;
abs1 = sqrt(real*real + complex*complex);
abs2 = sqrt(val1*val1 + val2 + val2);
angle1 = FindAngle(complex, real);
angle2 = FindAngle(val2, val1);
absFinal = abs1 / abs2;
angleFinal = angle1 - angle2;
real = absFinal * cos(angleFinal);
complex = absFinal * sin(angleFinal);
}
void SetVal(double val1, double val2)
{
real = val1;
complex = val2;
}
void PrintVal()
{
std::cout << "Number = " << real << " + j" << complex << std::endl;
}
};
int _tmain(int argc, _TCHAR* argv[])
{
Real r = Real(3);
system("PAUSE");
return 0;
}
