bmp对比程序，自动将两bmp文件进行对比，不同处以黑点表示-bmp contrast procedures, bmp files automatically compare the two different fine black dots

在一张黑色的BMP图上画上数字，每1秒改变一次数字，从0到9循环改变并显示出来。（有兴趣的可以修改下代码做成一个数字时钟出来）,运行环境是在linux下,C语言编译的代码-Drew numbers on a piece of black BMP chart, each second change a number, from 0 to 9 cycles and display. (interested can modify the code into a digital clock out)