说明：  C语言编写的多边形分解。先画出点，然后右键可以选择把点坐标储存到TXT文件，或者生产多边形。生成多边形后可以分解成三角形。成功通过编译跟运行。文件里面有可以直接运行的程序
(C language polygon decomposition. First draw a point, and then you can choose the right point coordinates stored in the TXT file, or the production of a polygon. After generating the polygon can be decomposed into triangles. Successfully compiled to run with. Files inside the program can be run directly)