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  1. #include <iostream>
  2. using namespace std;
  3.  
  4.  
  5. class MovingMagic {
  6. 	public:
  7. 		void updateValue(double x) {
  8. 			if (!init_) {
  9. 				init_ = true;
  10. 				cv_ = x;
  11. 			} else {
  12. 				cv_ = cv_ * 0.999 + x * 0.001;
  13. 			}
  14. 		}
  15.  
  16. 		double getValue() {
  17. 			return cv_;
  18. 		}
  19. 	private:
  20. 		bool init_{false};
  21. 		double cv_{0};
  22. };
  23.  
  24. int main() {
  25. 	MovingMagic magic;
  26. 	double sum = 0;
  27. 	for (size_t i = 10000; i > 0; --i) {
  28. 		double value = i;
  29. 		magic.updateValue(value);
  30. 		sum += value;
  31. 	}
  32. 	std::cout << magic.getValue() << " " << sum / 10000 << std::endl;
  33. 	return 0;
  34. }
Success #stdin #stdout 0s 3456KB
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999.955 5000.5
https://ideone.com/OGcDD1
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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