These two are the constructors for LinearHashingFile. The first constructor is used to create a new index. name is the name of the index to be created. length is the length of the key and type is the type of the key. N is the number of initial buckets. The default value of N is 1. status returns the status of the operation. The second constructor is used to open an existing index. It only takes 2 arguments: status as the returning status of the operation and name as the name of the index to be opened.