fork download
copy 
  1. #include <iostream>
  2. using namespace std;
  3.  
  4. template<typename Num>
  5. class Val {
  6. public:
  7. 	Val(Num value): firstvalue(value), value(value), state(0) {}
  8. 	operator Num() const { return value; }
  9. 	const Val operator - () const {
  10. 		switch(state){
  11. 		case 0: return Val(firstvalue, fkt(firstvalue), 1);
  12. 		case 1: return Val(firstvalue, 1 + firstvalue, 2);
  13. 		case 2: return Val(firstvalue, firstvalue > 0 ? firstvalue : -firstvalue, 3);
  14. 		case 3: return Val(firstvalue, - firstvalue, 4);
  15. 		case 4: return Val(firstvalue, firstvalue, 0);
  16. 		}
  17. 	}
  18. private:
  19. 	Val(Num firstvalue, Num value, int state):
  20. 		firstvalue(firstvalue), value(value), state(state) {}
  21.  
  22. 	static Num fkt(Num num) { return num > 0 ? num * fkt(num-1) : 1; }
  23.  
  24. 	const Num firstvalue;
  25. 	Num value;
  26. 	int state;
  27. };
  28.  
  29. int main() {
  30. 	Val<int> v(4);
  31.  
  32. 	cout << v << " "
  33. 		<< -v << " "
  34. 		<< -(-v) << " "
  35. 		<< -(-(-v)) << " "
  36. 		<< -(-(-(-v))) << " "
  37. 		<< -(-(-(-(-v))));
  38. 	return 0;
  39. }
Success #stdin #stdout 0s 3340KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
4 24 5 4 -4 4
https://ideone.com/Y9276N
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!