Author: Shashikant Kadam
B+ Tree implementation using C++
Requirements: C++ compiler (ex. g++)
Compile instructions: Give the following command in terminal:

$g++ bptree.C

Run instructions: Give the following command in terminal:

$./a.out <optional log file>

Operations:

1. Creating a fresh tree: simply execute without any log file ($./a.out)
   give insert <key> command in the program
2. Inserting keys: give insert <key> command in the program
3. Deleting keys: give delete <key> command in the program
4. Search keys: give search <key> command in the program
5. Display tree in depth first manner: give display command in the program
6. Save log: give save command in the program and then give filename
7. Load tree from a log file: simply execute with a log file ($./a.out <log file>)
8. Exit and free memory: give exit command in the program