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// PROGRAMER:  Chad Langston, clangsto@vt.edu
// NAME:  index2.exe
// LASTCOMPILED:  8/5/2000
// OS:  Windows 95 SE
// COMPILER:  MSVC++ 6.0(service pack4)
//
// USAGE:
// index2.exe [text file] [command file] [log file]
//
// text file must store records in the following format:
//
// Number of Records in database file:   10
// --------------------
// name
// street
// city	state	zip
// phone
// --------------------
// .  .  .
// --------------------
// 
// that is, it must begin with the first line.  The records must be seperated by a line
// of dashes.  the city, state and zip fields must be tab seperated and all fields must 
// end in newline.
//
// HANDLING:
// This program will return an error message and exit in the following cases:
// 1. The program is not executed properly
// 2. The input file does not exist.
// 3. The ouput file does not exist.
//	
// SUMMARY:
// Initially, Index2.exe reads records from a text file and stores the name field and 
// the file position of the record in a Hash Table.  It also stores the zip code field 
// and the file position of the record in an Inverted Table.  It then reads commands 
// from a command file and perfoms the precribed actions.  The commands are as follows:
//
// name		<name>
// zip		<zipcode>
// insert	<name>	<street>	<city>	<state>	<zip>	<phone>
// delete	<name>
// change	<name>	<phone>
// hashtable
// invertedtable
// exit
//
// Commands are case sensitive and they must be tab delimeted ending with a newline. 
// Output is sent to the user specified log file in a tabular form.
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