For this lab, you are to take the editor, expresion evaluator, and hashtable that we created in class and turn them into a BASIC interpreter.

These can all be found at 

knight.cis.temple.edu/~lafollet/2168/examp6/project

As I stated in class, you need to implement:

a RUN command.  It should have two flavors
1) RUN alone on the command line should start the program executing at the lowest numbered line it can find.
2) RUN along with a line number should begin at the first line number it
finds that is greater than or equal to the specified number

For instance, given the program
10 LET X = 10
20 LET Y = 20
30 PRINT X + Y
40 LET Z = 25
50 PRINT Z
60 EXIT

If you type RUN it should execute all 6 statements.
If you type RUN 35, it should execute only 40 through 60

The GOTO command which shoujld look like
20 GOTO 100
This would transfer the flow of execution to line 100

IF <relational expression> THEN statement

where <relatinal expression> is an expression involving < <= > >= = !=

Also you should tidy up the error handling in what I have given you, and
arrange for the INPUT and PRINT sttements to have a list of memory cells.

PRINT x, y, z should print all three expressions.

If you get done and want to do more, consider adding the ability to
handle text strings.  Traditionally, BASIC took any variable name
including a $ to be a string variable.