[REBOL] Re: let's re-visit math oper. in a var.
From: anton:wilddsl:au at: 4-Apr-2009 17:25
Just before you go, try this:
Paste it into your console or put it in a script.
print "Press escape to exit the loop."
forever [
num1: to-integer ask "Enter the 1st number: "
num2: to-integer ask "Enter the 2nd number: "
op: all [pos: find "+-*/" ask "Enter an operator [+ - * /]: " get to-word form first
pos]
result: op num1 num2
print ["result:" result]
]
Note that TO-INTEGER needs valid input, or errors to be trapped,
but we can add that later. OP is here guaranteed to be one of the
four operators or NONE (thanks to ALL).
Regards,
Anton.
mumpsoid-gmx.com wrote:
