fork download 
  1. #include <iostream>
  2. #include <string>
  3. #include <algorithm>
  4.  
  5. using namespace std;
  6.  
  7. void reverse(string& word)  
  8. {
  9.     unsigned int end = word.size() - 1;
  10.     for ( unsigned int i = 0; i < end; i++, end-- )
  11.     {
  12.         char c = word[end];
  13.         word[end] = word[i];
  14.         word[i] = c;
  15.     }
  16. }
  17.  
  18. void reverse_rec( string& word )
  19. {
  20.     if ( word.size() <= 1 ) return;
  21.  
  22.     string tmp = word.substr( 1, word.size() - 2 );
  23.     reverse_rec( tmp );
  24.     word = word.substr( word.size() - 1 ) + tmp + word[0];
  25. }
  26.  
  27. int main()
  28. {
  29.     string str( "This is a test");
  30.     reverse(str);
  31.     std::cout << str << std::endl;
  32.  
  33.     reverse_rec(str);
  34.     std::cout << str << std::endl;
  35.  
  36.     std::reverse(str.begin(), str.end());
  37.     std::cout << str << std::endl;
  38.     return 0;
  39. }
Success #stdin #stdout 0s 3432KB
comments (?)
stdin 
Standard input is empty
stdout 
tset a si sihT
This is a test
tset a si sihT
https://ideone.com/G2YIno
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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!