CRC code short

#include <iostream>
#include <string>

using namespace std;

// Function to perform CRC error detection
string performCRC(const string& data, const string& divisor) {
    string dividend = data;

    int divisorLength = divisor.length();
    int dataLength = data.length();

    // Append zeros to the dividend to match the divisor length
    for (int i = 0; i < divisorLength - 1; i++) {
        dividend += '0';
    }

    // Perform division
    for (int i = 0; i < dataLength; i++) {
        if (dividend[i] == '1') {
            for (int j = 0; j < divisorLength; j++) {
                dividend[i + j] = (dividend[i + j] == divisor[j]) ? '0' : '1';
            }
        }
    }

    // Extract the remainder (CRC)
    string remainder = dividend.substr(dataLength, divisorLength - 1);
    return remainder;
}

int main() {
    string data1;
    string divisor;
    string data2;
    cout << "Enter data (7/8 bits): ";
    cin >> data1;

    cout << "Enter divisor: ";
    cin >> divisor;

    string crc1 = performCRC(data1, divisor);

    cout << "CRC (Remainder): " << crc1 << endl;

    cout <<"Enter the recieved packet:";
    cin>>data2;

    string crc2=performCRC(data2,divisor);
    cout<<"New remainder:"<<crc2<<endl;

    if(crc1==crc2){
        cout<<"no error"<<endl;
    }
    else{
        cout<<"error"<<endl;
    }
    return 0;
}