通过字符串操作模拟控制台的cd命令，要求至少完成 “cd 【目录名】”、“cd ..” 和“cd \” 三个命令。实例可以参考:开始->运行->cmd->键入上述三个命令观察提示符前的字符串变化，帮助可通过cd /?显示；可使用字符串处理函数。并用此程序练习和熟悉调试过程。

实验014：重写实验007和012，要求使用函数IsPrime实现判断一个数是否是素数，GCD返回两个数的最大公约数，LCM返回两个数的最小公倍数，并在main中调用。-Through the string of CD command console operation simulation, require at least finish "CD [directory name]", "CD.." And "CD \" three orders. Examples can reference: start- > > > CMD- running- the above three orders typed observation prompt before the string change, help by CD /? Display　Can use string processing function. The use of this procedure practice and familiar with the debugging process.

Experimental 014: rewrite experimental 007 and I use function, the requirement IsPrime realize whether a number is a prime, the GCD returns the maximum two Numbers, LCM returns when the minimum two Numbers in LCD, and main invokes.