DaniWeb Forum Index > Software Development > C++

C++ RSS

Trouble writing code for arithmetic calculations of complex numbers

•

Join Date: Nov 2004

Posts: 2

Reputation: scrappy is an unknown quantity at this point

Solved Threads: 0

scrappy

Offline

Newbie Poster

Trouble writing code for arithmetic calculations of complex numbers

Nov 13th, 2004

I'm taking CMIS140, and I have a project using complex numbers. I can't figure out how to write the calculations into the program. I have attached the project, and the code I have written at this point. If anyone has any suggestions on how to do this, I would appreciate it.

Attached Files

	Project P3 Complex Numbers.cpp (3.1 KB, 35 views)
	ComplexNumbers.doc (20.5 KB, 34 views)

•

Join Date: Nov 2004

Posts: 6,145

Reputation: jwenting is just really nice

Solved Threads: 212

jwenting

Offline

duckman

Re: Trouble writing code for arithmetic calculations of complex numbers

Nov 13th, 2004

paste your code inside code tags instead of attaching the sourcefiles. M
Makes it a lot easier for everyone to see what you're talking about.

And posting your assignment verbatim doesn't help either (but at least you're honest stating it's a school assignment

).

Now for a bit of help to get you started.
I've yesterday for fun and training (I've been more or less out of C++ for years, starting to get pretty rusty) created a class that does addition and subtraction of complex numbers.
The rest you can easily think up to do yourself, they work similarly.

I'll not post the full implementation (which is pretty trivial) nor the test application (which is even more trivial), but the headerfile giving all function prototypes.
That should give you enough hints to get started implementing the system yourself.

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include <iostream>
 
using namespace std;
 
class complexNumber
{
private:
	float real; // real part
	float imag; // imaginary part
 
public:
	complexNumber();
	complexNumber(float rPart, float iPart);
	~complexNumber(); // for form's sake, not really needed
 
	complexNumber operator+(const complexNumber& c); // addition, so you can call 'c = a + b' where a,b, and c are complexNum objects
	complexNumber operator-(const complexNumber& c); // same for subtraction
	friend ostream& operator<<(ostream& s,  const complexNumber& c); // so you can do for example 'cout << a' where a is a complexNumber object
};
#include <iostream>

using namespace std;

class complexNumber
{
private:
	float real; // real part
	float imag; // imaginary part

public:
	complexNumber();
	complexNumber(float rPart, float iPart);
	~complexNumber(); // for form's sake, not really needed

	complexNumber operator+(const complexNumber& c); // addition, so you can call 'c = a + b' where a,b, and c are complexNum objects
	complexNumber operator-(const complexNumber& c); // same for subtraction
	friend ostream& operator<<(ostream& s,  const complexNumber& c); // so you can do for example 'cout << a' where a is a complexNumber object
};

you can of course include far more functionality than this, but this should be a good start.

•

Join Date: Nov 2004

Posts: 2

Reputation: scrappy is an unknown quantity at this point

Solved Threads: 0

scrappy

Offline

Newbie Poster

Re: Trouble writing code for arithmetic calculations of complex numbers

Nov 14th, 2004

Thank you for your help, and it did help. Now I keep getting the following error, and I don't know what it means.

error C2556: 'int __thiscall ComplexNumbers::AddComp(const class ComplexNumbers &,const class ComplexNumbers &)' : overloaded function differs only by return type from

•

Join Date: Nov 2004

Posts: 6,145

Reputation: jwenting is just really nice

Solved Threads: 212

jwenting

Offline

duckman

Re: Trouble writing code for arithmetic calculations of complex numbers

Nov 14th, 2004

You probably made a typo somewhere in the return type of a function.
If you define 2 functions of the same name (overloaded functions) in the same namespace (or class) they are required to have different argument lists else the compiler and runtime don't know which function to call.

•

Join Date: Sep 2004

Posts: 7,540

Reputation: Narue has a reputation beyond repute

Solved Threads: 704

Narue

Offline

Code Goddess

Re: Trouble writing code for arithmetic calculations of complex numbers

Nov 14th, 2004

>they are required to have different argument lists
Or constness for member functions. The following introduces no ambiguity yet the return types and argument lists for the overloaded function are identical:

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include <iostream>
 
using std::cout; using std::endl;
 
class test {
public:
  void f() { cout<<"f()"<<endl; }
  void f() const { cout<<"f() const"<<endl; }
};
 
int main()
{
  test t;
  const test s;
 
  t.f(); // Will print f()
  s.f(); // Will print f() const
}
#include <iostream>

using std::cout; using std::endl;

class test {
public:
  void f() { cout<<"f()"<<endl; }
  void f() const { cout<<"f() const"<<endl; }
};

int main()
{
  test t;
  const test s;

  t.f(); // Will print f()
  s.f(); // Will print f() const
}