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  1. #include <iostream>
  2.  
  3. class Number
  4. {
  5. protected:
  6.     int magnitude_;
  7. public:
  8.     static Number* fromInt(int x);
  9.  
  10.     virtual ~Number() {}
  11.  
  12.     int getMagnitude() { return magnitude_; }
  13.     virtual void print() = 0;
  14. };
  15.  
  16. class PositiveNumber: public Number
  17. {
  18. public:
  19.     PositiveNumber(int magnitude) { magnitude_ = magnitude; }
  20.     void print() { std::cout << "positive " << magnitude_ << "\n"; }
  21. };
  22.  
  23. class NegativeNumber: public Number
  24. {
  25. public:
  26.     NegativeNumber(int magnitude) { magnitude_ = magnitude; }
  27.     void print() { std::cout << "negative " << magnitude_ << "\n"; }
  28. };
  29.  
  30. Number* Number::fromInt(int x)
  31. {
  32.     if (x >= 0) { return new PositiveNumber(x); }
  33.     else        { return new NegativeNumber(x); }
  34. }
  35.  
  36. int main (int argc, char* argv[])
  37. {
  38.     Number* x = Number::fromInt(5);
  39.     x->print();
  40.     delete x;
  41.  
  42.     x = Number::fromInt(-5);
  43.     x->print();
  44.     delete x;
  45.  
  46.     return 0;
  47. }
Success #stdin #stdout 0s 5640KB
comments (?)
stdin
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Standard input is empty
stdout
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positive 5
negative -5
https://ideone.com/zhwK0z
language:
C++ 4.3.2 (gcc-4.3.2)
created:
4 years ago
visibility:
public

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