Шифрование

#include <iostream>
#include <stdlib.h>
#include <bitset>
#define n 7
using namespace std;
int main()
{
    system("title = LFSR");
    //Initialize n-bit binary data, the initial state is binary 1000, and decimal 8
    bitset<n>bint(64);
    bitset<n>str(bint);
     string s1,s2;//Save the output result
     //Traverse the numbers in bint
    /*for (int i = bint.size()-1; i>=0; i--)
        cout << bint[i];
    cout << endl;*/
     cout << "The initial state is: "<<bint.to_string() << endl;
     //str = bint.to_string();//If it is string type str, use this sentence
     //Generate status change of LFSR
    do
    {
        int j = bint[n - 1] ^ bint[0];
         bint.operator>>=(1);//shift 1 bit to the right
         //The first data and the nth data are XORed and then assigned to the nth
        bint[n - 1] = j;
        cout << bint.to_string() << endl;
         //Convert bint to string into s1
        s1 = bint.to_string();
         //Put a1 into s2
        s2.push_back(s1[3]);
 
    } 
    while (str.to_string() != bint.to_string());
     cout << "The output sequence is:" <<s2<< endl;
    system("pause");
    return 0;
}