一个简单的计算器，是在Xcode上实现，用Objective-C编译。-A simple calculator is in Xcode to achieve, in Objective-C compiler.

objective-c 的计算器，适合初学者，有很多的帮助-objective-c calculator, suitable for beginners, there is a lot of help

OC写的一个关于三角函数的计算器功能 关于分类以及协议， Programming in OC书上的 chapter11中的第四题-The functions sin(), cos(), and tan() are part of the C Standard Library (as scanf () is). These functions are declared in the system header file math.h, which is automatically impo

基于Object-C的简单计算器的实现，采用XCODE框架制作-a simple calculator