Calculator2160918252009

说明：  A Calculator Terms of Agreement: By using this code, you agree to the following terms... 1) You may use this code in your own programs (and may compile it into a program and distribute it in compiled format for languages that allow it) freely and with no charge. 2) You MAY NOT redistribute this code (for example to a web site) without written permission from the original author. Failure to do so is a violation of copyright laws. 3) You may link to this code from another website, but ONLY if it is not wrapped in a frame. 4) You will abide by any additional copyright restrictions which the author may have placed in the code or code s description.