说明：  该源文件在Microsoft Visual C++ 6.0环境下编译通过,程序目的旨在基于文件操作fopen等函数，以及bmp编码格式技术,绘制简单的函数曲线（圆，正弦），结果保存在位图Image.bmp中,该程序还可以扩展功能，修改方程，生成自己想要的图片
(The source file in Microsoft Visual C++ 6.0 environment, compiled by the program is aimed at file-based operations such as fopen function, as well as bmp encoding techniques, draw a simple function curve (circle, sine), the result stored in bitmap Image.bmp , the program can also be extended functionality, modify the equation, the picture you want to generate their own)