reverse a string

reverse.cpp

// Compile with g++ -std=c++14 reverse.cpp

#include <iostream>     // std::cout
#include <string>       // std::string
#include <utility>      // std::swap
using namespace std;

string reverse(string & s) {           
    // Ternary conditional                              
    // If string is of even length, n = string length              
    // If string is of odd length, n = string length divided by 2. 
    // This way we can reverse strings of both even and odd length.
    int n = (s.size() % 2 == 0) ? s.size() - 1 : s.size()/2;       
    for (int i = 0; i < n; ++i) {                       
        swap(s[i], s[s.size() - i - 1]);                
    }                                   
    return s;                                 
}                                             
                                              
int main() {                                  
    string str{"Programming is so much fun!"};   
    string rts{"good"};                       
    cout << str << '\n';                                           
    str = reverse(str);                                            
    cout << str << '\n';                                           
    cout << '\n';                                                  
    cout << rts << '\n';                                           
    rts = reverse(rts);                                            
    cout << rts << '\n';                                           
    return 0;                                                      
}