//+------------------------------------------------------------------+
//|                                            sort_string_array.mq5 |
//|                                        Copyright © 2018, Amr Ali |
//|                             https://www.mql5.com/en/users/amrali |
//+------------------------------------------------------------------+
#include "Introsort.mqh"

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void OnStart()
  {
   string array[25];

//--- Generate random data.
   for(int i = 0; i < 25; i++)
     {
      array[i] = "currency_" + IntegerToString(rand(),5,'0');
     }

   Introsort(array);

   ArrayPrint(array);
  }
//+------------------------------------------------------------------+

//--- Uncomment these 2 lines to sort in descending order.

//bool Less(const string left,const string right)
//  { return left > right;  }