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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <iterator>
  4. using namespace std;
  5.  
  6.  
  7. void reverse(int * from, int * to) {
  8.   while ((to - from) > 1) {
  9.     --to;
  10.     int temp = *from;
  11.     *from = *to;
  12.     *to = temp;
  13.     ++from;
  14.   }
  15. }
  16.  
  17. int const * find(int const * from,
  18.                  int const * const to,
  19.                  int const value) {
  20.   while ((from != to) && (*from != value)) {
  21.     ++from;
  22.   }
  23.   return from;
  24. }
  25.  
  26. void reverse_until (int * const from,
  27.                                   int * const to,
  28.                                   int const sentinel) {
  29.   int const * const position_sentinel = find(from, to, sentinel);
  30.   reverse(from, from + (position_sentinel - from));
  31. }
  32.  
  33.  
  34. int main() {
  35.   int test[10];
  36.   for (size_t i = 0; i < 10; ++i) {
  37.     test [i] = i + 1;
  38.   }
  39.   reverse_until (test, test + 10, 6);
  40.   copy(test, test + 10, ostream_iterator<int>{cout, " "});
  41.   return 0;
  42. }
Success #stdin #stdout 0s 3460KB
comments (?)
stdin 
Standard input is empty
stdout 
5 4 3 2 1 6 7 8 9 10
https://ideone.com/GYa4aT
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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