用c语言实现的简易计算器，键盘操作，图形界面，可以进行四则运算-use of simple language calculator, keyboard, graphics interface, for four Operational

说明：C语言课程设计作品功能：仿Windows的自带计算器环境：DOS大小：800多行特色：图形界面，支持鼠标，算法稍有复杂 -Descr iption: C language curriculum design works features: imitation of its own Windows Calculator Environment: DOS Size: 800 multi-line features: a graphical interface to support the mo

纯C语言编写的常见函数（冲激、阶跃、三角、指数、自定义函数，均可设置自定义系数）的FFT运算并画图显示。运行需要graphics.h。TURBO C++ 3.0运行通过。压缩包中包括一些C语言图形界面的简单教程。-A C program that can calculate common functions FFT and show the graphics. It is run successfully in Turbo C++ 3.0 with graphics.h.