[Solved] Why my strings are not going to be XOR?

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Just another try on the code base of the question ,

#include<iostream>
#include<string.h>
using namespace std;

int main()
{
  string pass;
  string enc="akdhigfohre";
  string x = "";
  string y = "";

   cout<<"Enter new password:  ";
   cin>>pass;
   cout<<"\n\nYour New Password is:" << pass<<endl;

   for(size_t i = 0; i < pass.size(); ++i){
     x += pass.at(i)^enc.at(i%enc.size());
   }
   cout<<"\n\nEncrypted Version: "<<x;

   for(size_t i = 0; i < x.size(); ++i){
     y += x.at(i)^enc.at(i%enc.size());
   }

   cout<<"\n\nRecovred Password:  "<<y;

   system("pause");
}

solved Why my strings are not going to be XOR?