Нааписание Шифра Цезаря с++ завал - C++ - Ответ 16682152

#include <iostream>
using namespace std;
 
const char lAlpha[] = { 'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z' };
const char uAlpha[] = { 'A','B','C','D','E','F','J','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z' };
 
int main()
{
    int n, shift, i;
    cout<<"Line length: ";
    cin >> n;
    cout<<"Enter shift: ";
    (cin >> shift).get();
    
    char *str = new char[n+1];
    cout<<"Enter line: ";
    cin.getline( str, n, '\n' );
    
    for( i=0; i<n; ++i )
    {
        if( str[i] >= 'a' && str[i] <= 'z' )
            str[i] = lAlpha[ (str[i]-'a'+shift) % 26 ];
        else if( str[i] >= 'A' && str[i] <= 'Z' )
            str[i] = uAlpha[ (str[i]-'A'+shift) % 26 ];
    }
    str[n]='0';
    cout<<"Crypted: "<<str<<endl;
    
    for( i=0; i<n; ++i )
    {
        if( str[i] >= 'a' && str[i] <= 'z' )
            str[i] = lAlpha[ ( (str[i]-'a') < shift ? (26+(str[i]-'a'-shift)%26) : (str[i]-'a'-shift) ) ];
        else if( str[i] >= 'A' && str[i] <= 'Z' )
            str[i] = uAlpha[ ( (str[i]-'A') < shift ? (26+(str[i]-'A'-shift)%26) : (str[i]-'A'-shift) ) ];
    }
    str[n]='0';
    cout<<"Decrypted: "<<str<<endl;
    
    delete str;
    return 0;
}