QT编写的简单计算器，比较简单实现加 减 乘 除,simple counter

普通计算器功能的实现（包含加、减、乘、除、取模、取余等功能）。-The realization of common calculator functions (including add, subtract, multiply, divide, modulus, take over other functions).

使用QT4实现的一个计算器，能够实现加、减、乘、除基本的功能，还能够实现清除功能。-QT4 achieved using a calculator, can be achieved add, subtract, multiply, divide the basic functions, but also to achieve clearance.