You can input HELP to get support
Legal commands are as follows:
HELP : Get help
RUN : Run the code in buffer
LOAD : Load code from existing txt file
LIST : No longer supported
CLEAR: Clear buffer, global variables, results and syntax tree
QUIT : Quit mini basic interpreter
INPUT: Input variable
LET : Assignment statement
PRINT: Print a constant number, a defined variable or a the value of legal expression
Legal statements are as follows:
10 INPUT m
20 LET m=10
30 IF m>=10 Then 50
40 END
50 PRINT m
60 GOTO 80
70 REM This line will be never executed
80 END
By using stacks to construct expression tree, this basic interpreter can do some simple integer calculations but overflow exception isn't handled yet. This interpreter can do negative number calculation.
Legal operands are as follows:
= : assignment
+ : add
- : subtract
* : multiply
/ : divide
** : power
== : equal
>= : greater equal
<= : less equal
There may be some bugs, and I'll be thankful if anyone can figure them out.