计算器是Windows操作系统提供的一个附件功能，许多人用Visual Basic、Visual C++等编制计算器，由于这些程序提供了控件，所以实现相对容易。Turbo C没有控件，但我们可以利用它所具有的函数模仿画出其界面，实现计算器的基本功能，进行浮点数加、减、乘、除、乘方和求模运算。-Calculator is a Windows operating system provides an attachment function, and many people use Visual Basic, Visual C++ such as the preparation of calculators, because these programs provide a control, it is relatively easy to achieve. Turbo C does not control, but we can use it to imitate the function has drawn the interface to achieve the basic functions of calculator to carry out floating-point add, subtract, multiply, divide, modulo involution and demand.