精简计算器，对于初学者来说是一个来熟悉visual c++的一个鲜明、典型例子，在编译过程中受益匪浅，故在此与大家分享。-Streamline the calculator, for beginners to become familiar with a distinctive visual c++, a typical example, benefited greatly during the compilation process, it is to share with you in th