Question

I have code that is supposed to show addition, subtraction, etc. of complex numbers with no input from the user necessary. I have three classes: test.cpp, complex.cpp, and complex.h to run the program, define the constructors and methods, and create a header class respectively. However, when I run my code I get a series of errors that I’ve been trying to figure out for a while now.

complex.h

//complex class definition
#ifndef COMPLEX_H
#define COMPLEX_H


//class complex
class Complex
{
public:
    Complex(); //default no arg constructor
    Complex(double a); //one arg constructor
    Complex(double a, double b); //two arg constructor
    Complex operator+(const Complex &) const; //addition method
    Complex operator-(const Complex &) const; //subtraction method
    Complex operator*(const Complex &) const; //multiplication method
    Complex operator/(const Complex &) const; //division method
    void print() const; //output
private:
    double a; //real number
    double b; //imaginary number
}; //end class Complex

#endif

complex.cpp

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

//no arg constructor
Complex::Complex()
{
    a = 0;
    b = 0;
}

//one arg instructor
Complex::Complex(double real)
{
    a = real;
    b = 0;
}

//two arg constructor
Complex::Complex(double real, double imaginary)
{
    a = real;
    b = imaginary;
}

//addition
Complex Complex::operator+(const Complex &number2) const
{
    return a + number2.a, b + number2.b;
}

//subtraction
Complex Complex::operator-(const Complex &number2) const
{
    return a - number2.a, b - number2.b;
}

//multiplication
Complex Complex::operator*(const Complex &number2) const
{
    return a * number2.a, b * number2.b;
}

//division
Complex Complex::operator/(const Complex &number2) const
{
    return a / number2.a, b / number2.b;
}

//output display for complex number
void Complex::print() const
{
    cout << '(' << a << ", " << b << ')';
}

test.cpp

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

int main()
{
    Complex b(1.0, 0.0);
    Complex c(3.0, -1.0);

    /*cout << "a: ";
    a.print();

    system ("PAUSE");*/

};

In test right now as the code shows the lower parts are commented out and I have attempted to only call two of the three constructors to see if I can get any of this working.

The errors I receive:

    error C2065: 'Complex' : undeclared identifier
    error C2065: 'Complex' : undeclared identifier
    error C2146: syntax error : missing ';' before identifier 'b'
    error C2146: syntax error : missing ';' before identifier 'c'
    error C3861: 'b': identifier not found  
    error C3861: 'c': identifier not found

I am trying to run this in Visual Studio 2010. Can someone please help?

Answer 1

You may facing a problem with stdafx.h issue

At least you should try to put #include "stdafx.h before every other include
Or
you could try to set your project property to not use stdafx.h

1. right click on project and select Properties
2. go to C/C++ -> Precompiled Headers 
3. select "Not Using Precompiled Headers"