calc> calc
331 Calculator example
(type ? for instructions 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.

>> 100
100

>> 1 + 1
2

>> 1+2*3
7

>> (1+2)*3
9

>> foo
0

>> foo = 100
100

>> bar = 2*foo
200

>> foo == bar
0

>> foo/2 == (50+50)/(1+1)
1

>> a = foo == 100
1

>> a
1

>> -42
-42

>> --42
42

>> 1--42
43

>> 1---42
-41

>> (((((1)))))
1

>> (1+(2)+((3)))
6

>> .
Exiting 331 calc