LINUX上的QT编程 是简单计算器的实现，包括的所有文件都在压缩包里-LINUX QT programming on the calculator is a simple implementation, including all the files inside the archive

简单计算器，可以实现加减乘除以及带括号的运算，利用堆栈实现-Simple calculator, arithmetic and computation can be achieved with parentheses, and use the stack to achieve