这是一个非常不错的四个函数计算器。这个代码允许用户输入多个操作才击中= s按钮。这个计算器支持*、/、-、+、可以切换显示值的符号。这是一个很好的例子,它使用了支持教程如何构建它。-This is a very good four-function calculator. This code allows the user to enter multiple operations before hitting the = s button. This calculator supports*, /,-,+, you can switch the display sign of the value. This is a good example, it uses the support tutorial on how to build it.