包含三个程序，两个是关于冒牌排序和多重循环的算法研究，另一个是实现在terminal中显示字符的程序，即实现c语言中的库函数printf-It contains three programs, two of which are on counterfeit sorting algorithm and multi-loop, and the other is to achieve terminal to display characters in the program, namely, the achievement c language library functions printf