C#

convert double with decimal places to any base in C# example : 19.879 to any base or -19.345 to any base

public interface IRepository<T> where T : class
{
    void Add(T entity);
    void AddRange(IEnumerable<T> entities);
    void Delete(T entity);
    void DeleteRange(IEnumerable<T> entities);
    T Get(int id);
    IEnumerable<T> Get(Expression<Func<T, bool>> expression);
    IEnumerable<T> GetAll();
}

public class BaseRepository<T> : IRepository<T> where T : class
{
    protected readonly DbContext _context;

    public BaseRepository(DbContext context)
    {
        _context = context;
    }

    // Interface methods here
}

public class CustomerRepository : BaseRepository<CustomerEntity>, ICustomerRepository
{
    public CustomerRepository(DbContext context)
        :base(context)
    {
    }

    public bool IsCustomerActive(int id)
    {
        return true;
    }
}

public class CustomerController : ControllerBase
{
    public bool CheckIfCustomerIsActive(int id)
    {
        var connString = "";

        var dc = new SqlDataContext(connString);

        ICustomerRepository repository = new CustomerRepository(dc);

        return repository.IsCustomerActive(id);
    }
}

public class BaseRepository<T> : IRepository<T> where T : class
{
    protected readonly DbContext _context;

    public BaseRepository()
    {
        // The base repo is the only place that gets the connection string
        var connString = Properties.Settings.Default.ConnectionString;

        // The base repo is the only place that knows about the db context
        _context = new SqlDataContext(connString);
    }

    // Interface methods here
}