reverse_string_or_array_stl.cpp

/*
 * =====================================================================================
 *
 *       Filename:  reverse_string_stl.cpp
 *
 *    Description:  
 *
 *        Version:  1.0
 *        Created:  03/04/2015 09:49:47 AM
 *       Revision:  none
 *       Compiler:  gcc/g++
 *
 *         Author:  Marius-Constantin Melemciuc  
 *          email:  
 *   Organization:  
 *
 * =====================================================================================
 */

#include <cstdio>
#include <iostream>
#include <string>

using namespace std;

void swap(char& a, char& b) {
    a = a ^ b;
    b = a ^ b;
    a = a ^ b;
}

void reverseString(string& str) {
    int str_length = str.length();

    for (int i = 0; i < (str_length >> 1); i++)
        swap(str[i], str[str_length - i - 1]);
}

/*

void reverseArray(vector<int>& array) {
    int n = array.size();

    for (int i = 0; i < (n >> 1); i++) {
        swap(array[i], array[n - i - 1]);
    }
}

*/

int main(int argc, char** argv) {
    string s;

    cin >> s;

    reverseString(s);

    cout << s;
}