c language programming 03

problem	answer
This work belongs courses	https://edu.cnblogs.com/campus/zswxy/CST2019-4/homework/10269
The operational requirements where	https://edu.cnblogs.com/campus/zswxy/CST2019-4/homework/10269
The target job	According to the last job, adding the use of rand () use
Text of the job	Using the menu frame from the last job, and increased subject all grades manipulation functions on the basis thereof
Other references	https://www.runoob.com/cprogramming/c-function-rand.html , Baidu, etc.