I'm a smartphone app developer. I want to make a app running in iOS,android,winphone. I use cocos2d-x platform tool to make this app. it base of c/c++ language. So, Dose anyone can tell me How to read and write excel with c/c++
For what purpose? Just reading the file can be done by treating it as an opaque stream of bytes, just like any other file.
I doubt that's what you really mean, though.
If you want to interpret the file's contents, and present/update the calculations, then surely you must realize that the answer to "how" that is done must be gigantic? Excel is a huge, huge, and very old application, probably the result of many millions of lines of code.
Nobody can tell you "how" to interpret that in a simple answer here.
The closest thing you can probably get here is a recommendation on a library to use. I had a quick look, and LibXL was the first one I found for C++. It is a commercial library, and I have no experience with it.