calexpgo

evaluate expression in reverse polish notation

examples :

> calexpgo 1 2 3 + -
4
> calexpgo 10 15 * ; 15 5 /
150
3
> calexpgo 3 DUP *
9

spec

Values are integer. Operators :

• +: addition,
• -: substraction,
• *: multiplication,
• /: integer division,
• %: modulo,
• dup : duplicate top of stack,
• swap : swap top and second of stack,
• drop : remove top of stack,
• over : add second of stack in top

Opérators are case insensitive