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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. typedef unsigned long long int ull;
  5. double g(double a) {return a*a;}
  6. double f(double a, ull n) {return n==1 ? a : n%2 ? a*f(a,n-1) : g(f(a,n/2));}
  7.  
  8. double MyPow(double a, ull n)
  9. {
  10.      double t=1.0;
  11.      for(ull i=1;i<=n;i++)
  12.          t*=a;
  13.      return t;
  14. }
  15.  
  16. int main() {
  17. 	double a = 1.000000005; ull n = 2000000000;
  18. 	cout << f(a,n) << endl;
  19. 	//cout << MyPow(a,n) << endl;
  20. 	return 0;
  21. }
Success #stdin #stdout 0s 3412KB
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22026.5
https://ideone.com/oq7NxE
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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