无聊时做的c语言小程序，能在运行时显示出生日快乐的字样，在程序中用了延时和清屏，对需要学习这方面知识的新手有参考作用。-Bored a small program to do the c language, can be displayed at run time happy birthday words, using the delay in the program and clear the screen, on the need to learn this knowledge with r