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  1. #include <iostream>
  2. #include <chrono>
  3. #include <cmath>
  4.  
  5. using namespace std;
  6. using namespace chrono;
  7.  
  8. const int TIMES = 10000000;
  9.  
  10. int main() {
  11. 	auto start = system_clock::now();
  12. 	double s = 0.0;
  13. 	for(int i=0;i<TIMES;++i){
  14. 		double x = static_cast<double>(i);
  15. 		s += x*x*x;
  16. 	}
  17. 	cout<<s<<" counted by mult in "<< (duration_cast<milliseconds>(system_clock::now()-start).count())<<"ms"<<endl;	
  18. 	start = system_clock::now();
  19. 	s = 0.0;
  20. 	for(int i=0;i<TIMES;++i){
  21. 		double x = static_cast<double>(i);
  22. 		s += pow(x,3);
  23. 	}
  24. 	cout<<s<<" counted by pow in "<< (duration_cast<milliseconds>(system_clock::now()-start).count())<<"ms"<<endl;
  25. 	return 0;
  26. }
Success #stdin #stdout 0.54s 15232KB
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Standard input is empty
stdout
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2.5e+27 counted by mult in 7ms
2.5e+27 counted by pow in 540ms
https://ideone.com/wreUyv
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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