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  1. #if !defined(__VECTORCPX_H)
  2. #define __VECTORCPX_H 1
  3.  
  4. #include <cstdlib>
  5. #include <cstdio>
  6. #include <climits>
  7. #include <limits>
  8. #include <iostream>
  9. #include <fstream>
  10.  
  11. using namespace std;
  12.  
  13. class VectorCpx;    //在定義Complex時，這個class還不知道什麼叫做VectorCpx，因此得先加這行"forward declaration"告訴他
  14. class Complex
  15. {
  16. 	private:
  17. 		double mReal, mImag;
  18.  
  19. 	public:
  20. 		Complex(double _real = 0, double _imag = 0);
  21. 		const double& real() const;
  22. 		const double& imag() const;
  23. 		void real(double value);
  24. 		void imag(double value);
  25. 		Complex operator+(const Complex& cpx) const;
  26. 		Complex operator-(const Complex& cpx) const;
  27. 		Complex operator*(const Complex& cpx) const;
  28. 		VectorCpx operator*(const VectorCpx& vc) const;
  29. 		Complex operator/(const Complex& cpx) const;
  30. };
  31.  
  32. ostream& operator<<(ostream& ostr, const Complex& cp);
  33.  
  34. //////////////////////////////////////////////////////////////
  35.  
  36. class VectorCpx
  37. {
  38. 	private:
  39. 		Complex *pCpx;
  40. 		unsigned mSize, mCapacity;
  41.  
  42. 	public:
  43. 		VectorCpx();	//default constructor
  44. 		VectorCpx(unsigned, const Complex&);	//constructor
  45. 		VectorCpx(unsigned);	//constructor
  46. 		VectorCpx(const VectorCpx&); //copy constructor
  47. 		~VectorCpx();	//destructor
  48.  
  49. 		VectorCpx& push_back(const Complex&);
  50. 		VectorCpx& resize(unsigned);
  51. 		VectorCpx& resize(unsigned, const Complex&);
  52. 		unsigned size() const;
  53. 		unsigned capacity() const;
  54. 		//Complex output(int) const;
  55.  
  56. 		Complex operator*(const VectorCpx& vc) const;
  57. 		VectorCpx operator*(const Complex& cpx) const;
  58. 		Complex& operator[](const int& place) const;	//這裡的Complex型態後面必須要加上"&"，因為回傳的值必須能拿到Complex class裡修改
  59. 		VectorCpx operator=(const VectorCpx vc) const;
  60. };
  61.  
  62. ostream& operator<<(ostream& ostr, const VectorCpx vc);
  63.  
  64. #endif
  65.  
Compilation error #stdin compilation error #stdout 0s 0KB
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Standard input is empty
compilation info 
/usr/lib/gcc/i486-linux-gnu/4.7/../../../i386-linux-gnu/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
collect2: error: ld returned 1 exit status
stdout
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Standard output is empty
https://ideone.com/a8fcFl
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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