用qt实现一个简单的计算器，这个计算器有简单的加、减、乘、除，根号，简单三角函数的功能。-this function is for the calc ,have add sub mul div.sqrt

自己设计的计算器，开发环境采用vc++ 6.0，程序代码设计采用C++主要功能：加，减，乘，除-Calculator development environment of their own design vc++ 6.0, code design using C++ main functions: add, subtract, multiply, in addition to