fork download
copy 
  1. #include <iostream>
  2.  
  3. class reverser
  4. {
  5. public:
  6. 	reverser(int orig) : orig(orig), done(false) {}
  7. 	int result() const { return done ? res : reverse(); }
  8. private:
  9. 	int reverse() const
  10. 	{
  11. 		res = 0;
  12. 		int n = orig;
  13. 	    while (n)
  14. 	    {
  15. 	        int last = get_last_digit(n);
  16. 	        add_last_digit(res, last);
  17. 	        remove_last_digit(n);
  18. 	    }
  19. 	    done = true;
  20. 	    return res;
  21. 	}
  22.  
  23. 	static void remove_last_digit(int& n) {
  24. 	    n /= 10;
  25. 	}
  26.  
  27. 	static int get_last_digit(int& n) {
  28. 	    return n % 10;
  29. 	}
  30.  
  31. 	static void add_last_digit(int& n, int digit) {
  32. 	    n = n * 10 + digit;
  33. 	}
  34.  
  35. 	mutable int res;
  36. 	const int orig;
  37. 	mutable bool done;
  38. };
  39.  
  40. int main()
  41. {
  42.     int n = 1023456;
  43.  	reverser* rev = new reverser( n );
  44.  	std::cout << rev->result() << std::endl;
  45.  	delete rev;
  46. }
Success #stdin #stdout 0s 3472KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
6543201
https://ideone.com/JMJ6Vk
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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!