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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class three_d {
  5.     int x, y, z;
  6. public:
  7.     three_d(int a, int b, int c) {x=a; y=b, z=c; }
  8.     three_d operator+(three_d op2);
  9.     friend ostream &operator<<(ostream &stream, three_d &obj);
  10.     friend ostream &operator<<(ostream &stream, const three_d &obj);
  11.     operator int() {cout << "converting to int"<< endl; return x*y*z;}
  12. };
  13. ostream &operator<< (ostream &stream, three_d &obj)
  14. {
  15.     stream << "(non-const) ";
  16.     stream << obj.x << ", ";
  17.     stream << obj.y << ", ";
  18.     stream << obj.z << endl;
  19.     return stream;
  20. }
  21. ostream &operator<< (ostream &stream, const three_d &obj)
  22. {
  23.     stream << "(const) ";
  24.     stream << obj.x << ", ";
  25.     stream << obj.y << ", ";
  26.     stream << obj.z << endl;
  27.     return stream;
  28. }
  29. three_d three_d::operator+ (three_d op2)
  30. {
  31.     cout << "adding" << endl;
  32.     x+=op2.x;
  33.     y+=op2.y; 
  34.     z+=op2.z; 
  35.     return *this;
  36. }
  37.  
  38. int main()
  39. {
  40.     three_d a(1, 2, 3), b(2, 3, 4);
  41.     cout << a << b;
  42.     cout << "b+100" << endl;
  43.     cout << b+100 << endl; //31 line
  44.     cout << "a+b" << endl;
  45.     cout << a+b << endl; // 32
  46.     return 0;
  47. }
  48.  
Success #stdin #stdout 0s 2900KB
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stdin
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Standard input is empty
stdout
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(non-const) 1, 2, 3
(non-const) 2, 3, 4
b+100
converting to int
124
a+b
adding
(const) 3, 5, 7
https://ideone.com/Mb0tOI
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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