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  1. #include <iostream>
  2. #include <string>
  3.  
  4. // complex.h
  5. namespace CN {
  6. class complex {
  7. public:
  8.     complex(int num);
  9.     friend std::string to_string(const complex &c);
  10.     friend std::ostream& operator<<(std::ostream& out, const complex& o);
  11.     friend std::istream& operator>>(std::istream& in, complex& o);
  12.  
  13. private:
  14.     int i;
  15. };
  16. }
  17.  
  18. // complex.cpp
  19. // #include "complex.h"
  20.  
  21. namespace CN {
  22. complex::complex(int num) {
  23.     i = num;
  24. }
  25.  
  26. std::string to_string(const complex &mc)
  27. {
  28.     return std::to_string(mc.i);
  29. }
  30.  
  31. std::ostream& operator<<(std::ostream &out, const CN::complex &mc)
  32. {
  33.     out << "CN::complex(" << to_string(mc) << ")";
  34.     return out;
  35. }
  36.  
  37. std::istream& operator>>(std::istream &in, CN::complex &mc)
  38. {
  39.     in >> mc.i;
  40.     return in;
  41. }
  42. }
  43.  
  44. //
  45. int main() {
  46.     CN::complex complex(111);
  47.     std::cin >> complex;
  48.     std::cout << complex << std::endl;
  49.     std::cout << to_string(complex) << std::endl;
  50. }
Success #stdin #stdout 0s 4236KB
comments (?)
stdin 
222
stdout 
CN::complex(222)
222
https://ideone.com/76X47y
language:
C++14 (clang 8.0)
created:
5 years ago
visibility:
public

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