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  1. #include <iostream>
  2. #include <array>
  3. #include <algorithm>
  4.  
  5. using namespace std;
  6.  
  7. template <typename T, size_t N>
  8. void swap_pairs(array<T, N>& arr)
  9. {
  10. 	bool is_odd = (N % 2 != 0);
  11. 	auto limit = (is_odd? N - 2 : N - 1);
  12. 	for (size_t i = 0; i < limit; i += 2) {
  13. 		swap(arr[i], arr[i + 1]);
  14. 	}
  15. }
  16.  
  17. template <typename Container>
  18. void print(const Container& c)
  19. {
  20. 	cout << "{ ";
  21. 	for (const auto& x : c) {
  22. 		cout << x << ' ';
  23. 	}
  24. 	cout << "}\n";
  25. }
  26.  
  27. int main() 
  28. {
  29. 	array<int, 6> arr_int = {
  30. 		1, 2, 3, 4, 5, 6
  31. 	};
  32. 	array<double, 5> arr_double = {
  33. 		10.5, 9.5, 8.5, 7.5, 6.5
  34. 	};
  35.  
  36. 	print(arr_int);
  37. 	swap_pairs(arr_int);
  38. 	print(arr_int);
  39.  
  40. 	print(arr_double);
  41. 	swap_pairs(arr_double);
  42. 	print(arr_double);
  43. }
Success #stdin #stdout 0s 4532KB
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stdin
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Standard input is empty
stdout
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{ 1 2 3 4 5 6 }
{ 2 1 4 3 6 5 }
{ 10.5 9.5 8.5 7.5 6.5 }
{ 9.5 10.5 7.5 8.5 6.5 }
https://ideone.com/COvMLp
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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