CRC code Aditya

#include<iostream>
using namespace std;

void show_array(int a[], int n){
    for(int i = 0; i < n; i++){
        cout << a[i] << " ";
    }
    cout << endl;
}

void division(int temp[], int gen[], int n, int r){
    for(int i = 0; i < n; i++){
        if(gen[0] == temp[i]){
            for(int j = 0, k = i; j < r + 1; j++, k++){
                if(!(temp[k] ^ gen[j]))
                    temp[k] = 0;
                else
                    temp[k] = 1;
            }
        }
    }
}

int main(){
    int n;
    cout << "Enter the size of data: " << endl;
    cin >> n;
    int dataword[20];
    int temp[20];
    cout << "Enter the data: " << endl;
    for(int i = 0; i < n; i++){
        cin >> dataword[i];
        temp[i] = dataword[i];
    }
    int generator[20];
    cout << "Enter the generator: " << endl;
    for(int i = 0; i < n; i++){
        cin >> generator[i];
    }
    cout << "Enter the size of codeword: " << endl;
    int code_size;
    cin >> code_size;
    for(int i = n; i < code_size; i++){
        temp[i] = 0;
    }
    cout << "Sender side: " << endl;
    cout << "The given dataword is: " << endl;
    show_array(dataword, n);
    cout << "The codeword is: " << endl;
    show_array(temp, code_size);
    division(temp, generator, n, (code_size - n));
    cout << "Syndrome is: " << endl;
    for(int i = n; i < code_size; i++){
        cout << temp[i] << " ";
    }
    cout << endl;
    int codeword[code_size];
    for(int i = 0; i < n; i++){
        codeword[i] = dataword[i];
    }
    for(int i = n; i < code_size; i++){
        codeword[i] = temp[i];
    }
    cout << "The codeword transmitted is: " << endl;
    show_array(codeword, code_size);

    cout << "\nReciever side: " << endl;
    cout << "Enter the codeword recieved: " << endl;
    int message[code_size];
    for(int i = 0; i < code_size; i++){
        cin >> message[i];
        temp[i] = message[i];
    }
    division(temp, generator, n, code_size - n);
    for(int i = n; i < code_size; i++){
        if(temp[i]){
            cout << "Error detected in message" << endl;
            return 0;
        }
    }
    cout << "No error detected in message" << endl;
    cout << "Recieved message is: " << endl;
    for(int i = 0; i < n; i++){
        cout << message[i] << " ";
    }
    cout << endl;
    return 0;
}