3dsmax: UI

-- UI
rollout addition "Addition of two numbers"
(
 -- UI elements
 edittext text1 "First number"
 edittext text2 "Second number"
 button b "Add"
 label lbl "Result"
 -- event handlers
 on b pressed do
 (
  a1 = text1.text as float
  a2 = text2.text as float
  c = a1 + a2
  lbl.text = c as string
 )
)

in MAXScript listener:

-- create a dialog 320 x 240
createDialog addition 320 240 

math operator: +, -, *, /
% = mod number1 to number 2
+=, -=, *=, /=