手写计算器penlet FO的Livescribe智能笔

writing calculator penlet fo livescribe smartpen. WriteCalc reads function that user write on dotpaper, parse it and displays result on smartpen. Operations are appended to function until user writes "=" character. For now application works only on integer values (both input and result). User can use functions: |+|plus| |:|:---| |-|minus| |x or *|multiply| |/ or : |divide | |^|power| |()|freely nested| In the beginning application asks to Write two letters: R and D. Tapping on R will clea(R) all text that user wrote and tapping on D will (D)elete last character.