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  1. #include <iostream>
  2.  
  3. class C {
  4. private:
  5.   int n;
  6. public:
  7.   C() {}
  8.   C(const C &ob) { this->n = ob.n; }
  9.   C(const int n) { this->n = n; }
  10.   ~C(){}
  11.   C &operator=(const C &ob) { this->n = ob.n; return *this; }
  12.   friend bool operator==(C const &a,  C const &b) { return (a.n == b.n); }
  13.   C operator+=(C const &ob) { this->n += ob.n; return *this; }
  14.   friend std::ostream &operator<<(std::ostream &stream, C const &ob) { stream << ob.n; return stream; }
  15.   friend C operator+(C const &a, C const &b) { C s; s = a; s += b; return s; }
  16. };
  17.  
  18. int main() {
  19.   C s = 0;
  20.   for (int n = 1; n <= 10; n++)
  21.     s += n;
  22.   std::cout << s << std::endl;
  23.  
  24.   s = 0;
  25.   for (int n = 1; n <= 100; n++)
  26.     s = n + s;
  27.   std::cout << s << std::endl;
  28.  
  29.   std::cout << (2 == s) << std::endl;
  30.   return 0;
  31. }
  32. /* end */
  33.  
Success #stdin #stdout 0s 15224KB
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https://ideone.com/pR0EP1
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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