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Error message help?

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Join Date: Sep 2004
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Error message help?

 
0
  #1
Sep 26th, 2004
Hello,

when i try to compile this program (it has three parts) I receive an error message that confuses me. Below are the code and error message.

C++ Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2.  
  3. using std::cout;
  4. using std::endl;
  5.  
  6. #include "Complex.h"
  7.  
  8. int main()
  9. {
  10. 	Complex x(2, 3), y(4, 5), z;
  11.  
  12. 	x.printComplex();
  13. 	cout << " + ";
  14. 	y.printComplex();
  15. 	cout << " = ";
  16. 	x.add(y);
  17. 	x.printComplex();
  18.  
  19. 	cout << '\n';
  20. 	x.setComplexNumber(10, 1); //reset Real
  21. 	y.setComplexNumber(11, 5); //reset Imaginery
  22. 	x.printComplex();
  23. 	cout << " - ";
  24. 	y.printComplex();
  25. 	cout << " = ";
  26. 	x.subtract(y);
  27. 	x.printComplex();
  28.  
  29. 	cout << '\n';
  30. 	x.equal(y);
  31. 	cout << endl;
  32.  
  33. 	return 0;
  34. }

C++ Syntax (Toggle Plain Text) 
  1. #ifndef Complex_H
  2. #define Complex_H
  3.  
  4. class Complex {
  5. public:
  6. 	Complex(double = 0.0, double = 0.0); //default constructor
  7. 	Complex Complex::add(Complex &);
  8. 	Complex Complex::subtract(Complex &);
  9. 	void printComplex(void);
  10. 	void setComplexNumber(double, double);
  11. 	Complex Complex::equal(Complex &x);
  12. private:
  13. 	double realPart;
  14. 	double imagineryPart;
  15. }
  16.  
  17. #endif

C++ Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2.  
  3. using std::cout;
  4.  
  5. #include <Complex.h>
  6.  
  7. Complex::Complex(double real, double imaginery)
  8. { setComplexNumber(real, imaginery); }
  9.  
  10. void Complex::add(Complex &)
  11. {
  12. 	realPart += a.realPart;
  13. 	imagineryPart =+ a.imagineryPart;
  14. }
  15.  
  16. void Complex::subtract(Complex &)
  17. {
  18. 	realPart -= s.realPart;
  19. 	imagineryPart -= s.realPart;
  20. }
  21.  
  22. void Complex::printComplex(void)
  23. { cout << '(' << realPart << ", " << imagineryPart << ')'; }
  24.  
  25. void setComplexNumber(double rp, dounle ip)
  26. {
  27. 	realPart = rp;
  28. 	imagineryPart = ip;
  29. }
  30.  
  31. bool Complex::equal(Complex &x) {
  32. 	return ((realPart == x.realPart) && 
  33. 		(imagineryPart == x.imagineryPart));
  34. }

The error msg says:
C:\IS20\Complex Classes\Complex.cpp(16) : error C2556: 'void __thiscall Complex::add(class Complex &)' : overloaded function differs only by return type from 'class Complex __thiscall Complex::add(class Complex &)'
c:\is20\complex classes\complex.h(10) : see declaration of 'add'
C:\IS20\Complex Classes\Complex.cpp(16) : error C2371: 'add' : redefinition; different basic types
c:\is20\complex classes\complex.h(10) : see declaration of 'add'
C:\IS20\Complex Classes\Complex.cpp(17) : error C2065: 'a' : undeclared identifier
C:\IS20\Complex Classes\Complex.cpp(17) : error C2228: left of '.realPart' must have class/struct/union type
C:\IS20\Complex Classes\Complex.cpp(18) : error C2228: left of '.imagineryPart' must have class/struct/union type
C:\IS20\Complex Classes\Complex.cpp(22) : error C2556: 'void __thiscall Complex::subtract(class Complex &)' : overloaded function differs only by return type from 'class Complex __thiscall Complex::subtract(class Complex &)'
c:\is20\complex classes\complex.h(11) : see declaration of 'subtract'
C:\IS20\Complex Classes\Complex.cpp(22) : error C2371: 'subtract' : redefinition; different basic types
c:\is20\complex classes\complex.h(11) : see declaration of 'subtract'
C:\IS20\Complex Classes\Complex.cpp(23) : error C2065: 's' : undeclared identifier
C:\IS20\Complex Classes\Complex.cpp(23) : error C2228: left of '.realPart' must have class/struct/union type
C:\IS20\Complex Classes\Complex.cpp(24) : error C2228: left of '.realPart' must have class/struct/union type
C:\IS20\Complex Classes\Complex.cpp(30) : error C2061: syntax error : identifier 'dounle'
C:\IS20\Complex Classes\Complex.cpp(33) : error C2065: 'ip' : undeclared identifier
C:\IS20\Complex Classes\Complex.cpp(36) : error C2556: 'bool __thiscall Complex::equal(class Complex &)' : overloaded function differs only by return type from 'class Complex __thiscall Complex::equal(class Complex &)'
c:\is20\complex classes\complex.h(14) : see declaration of 'equal'
C:\IS20\Complex Classes\Complex.cpp(36) : error C2371: 'equal' : redefinition; different basic types
c:\is20\complex classes\complex.h(14) : see declaration of 'equal'


I do not understand what that means. Can anyone help me? Thanks so much, I really appreciate it a lot.
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Re: Error message help?

 
0
  #2
Sep 26th, 2004
Hi, thanks for reading my message. I've changed my code a bit and I get it to compile but the math is wrong.

C++ Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2.  
  3. using std::cout;
  4. using std::endl;
  5.  
  6. #include "Complex.h"
  7.  
  8. int main()
  9. {
  10. 	Complex x;
  11. 	Complex y( 3, 4);
  12. 	Complex z( 6, 2);
  13.  
  14. 	cout << "x: ";
  15. 	x.printComplex();
  16. 	cout << "\ny: ";
  17. 	y.printComplex();
  18. 	cout << "\nz: ";
  19. 	z.printComplex();
  20.  
  21. 	x = y + z;
  22. 	cout << "\n\nx = y + z:\n";
  23. 	x.printComplex();
  24. 	cout << " = ";
  25. 	y.printComplex();
  26. 	cout << " + ";
  27. 	z.printComplex();
  28.  
  29. 	x = y - z;
  30. 	cout << "\n\nx = y - z:\n";
  31. 	x.printComplex();
  32. 	cout << " = ";
  33. 	y.printComplex();
  34. 	cout << " - ";
  35. 	z.printComplex();
  36. 	cout << endl;
  37.  
  38.  
  39. 	return 0;
  40. }// end main

C++ Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2.  
  3. using std::cout;
  4.  
  5. #include "Complex.h"
  6.  
  7. Complex::Complex(double realPart, double imagineryPart)
  8. : real( realPart ),
  9. 	imaginery( imagineryPart)
  10. {
  11. 	//empty body
  12. }
  13.  
  14. //addition
  15. Complex Complex::operator+( Complex &operand2) 
  16. {
  17. 	 return Complex( real + operand2.realPart, 
  18. 		imaginery + operand2.imagineryPart );
  19. }//end
  20.  
  21. //subtraction
  22. Complex Complex::operator-( Complex &operand2) 
  23. {
  24. 	return Complex( real - operand2.realPart,
  25. 		imaginery - operand2.imagineryPart );
  26. }//end
  27.  
  28. //display in form (a, b)
  29. void Complex::printComplex() const
  30. { 
  31. 	cout << '(' << realPart << ", " << imagineryPart << ')'; 
  32. }
  33.  
  34. //equal or not
  35. bool Complex::equal(Complex &x) {
  36. 	return ((realPart == x.realPart) && 
  37. 		(imagineryPart == x.imagineryPart));
  38. }

C++ Syntax (Toggle Plain Text) 
  1. #ifndef Complex_H
  2. #define Complex_H
  3.  
  4. class Complex {
  5. public:
  6. 	Complex(double = 0.0, double = 0.0); //default constructor
  7. 	Complex Complex::operator+( Complex &);
  8. 	Complex Complex::operator-( Complex &);
  9. 	void printComplex() const;
  10. 	bool Complex::equal(Complex &x);
  11. private:
  12. 	double realPart;
  13. 	double imagineryPart;
  14. 	double real;
  15. 	double imaginery;
  16. };
  17.  
  18. #endif

Could you please look this over and tell me what myself and the debugger are messing up?

Also, how do I make use of the equal function so that it doesn't just sit there?

Thanks for your help.
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