Script started on Mon 26 Mar 2012 12:58:26 PM EDT
linux2[1]% ./calc
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.

>> = true 1
1

>> = false 0
0

>> + 1 2
3

>> + + 1 2 3
6

>> + 1 + 2 3
6

>> ==   + + 1 2 3  + 1 + 2 3
1

>> + * 2 3 4
10

>> * + 2 3 4
20

>> + 2 * 3 4
14

>> = a 100
100

>> = b a
100

>> = a + a 1
101

>> > a 100
1

>> not true
0

>> not false
1

>> not not true
1

>> not < a 101
1

>> and 1 0
0

>> and 1 1
1

>> and > a 100 > a b
1

>> or true false
1

>> or false or false or false true
1

>> (or false (or false (or false true)))
1

>> (or (or (or false false) false) true)
1

>> or > a b > b a
1

>> and > a 100 or > a b > b a
1

>> (and (> a 100) (or (> a b) (> b a)))
1

>> if true 100 200
100

>> if false 100 200
200

>> if == 100 + 99 1 ~1 ~2
-1

>> .
Exiting 331 calc