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 reference to the role of the novice.