331 Calculator
(type ? for help and . to exit)

>> Enter an expression in infix notation followed by a newline.
Operators include +, -, * and =.  Defined functions include
sqrt, exp and log.  You can assign a variable using the =
operator. Type . to exit.  Syntax errors will terminate the
program, so be careful.

>> 1

>> 0

>> 3

>> 6

>> 6

>> 1

>> 10

>> 20

>> 14

>> 100

>> 100

>> 101

>> 1

>> 0

>> 1

>> 1

>> 1

>> 0

>> 1

>> 1

>> 1

>> 1

>> 1

>> 1

>> 1

>> 1

>> 1

>> 100

>> 200

>> -1

>> Exiting 331 calc