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system
generate a code snippet in c++ that reverses a given string.
user
#include <iostream>
#include <string>

using namespace std; 

string reversestring(string s) 
{ 
    int n = s.length(); 
  
    // swap character starting from two 
    // corners 
    for (int i = 0; i < n / 2; i++) 
        swap(s[i], s[n - i - 1]); 
  
    return s; 
} 
  
// driver program 
int main() 
{ 
    string s = "hello"; 
    s = reversestring(s); 
    cout << "reversed string is : "
         << s; 
    return 0; 
}
assistant