Introduction - If you have any usage issues, please Google them yourself
The function of 10 students from high to low ranking, improved function, n students from high to low ranking, ranked according to function way style parameters such as "a style, style, by ascending to d" (in descending, d/a: ascending descending upon:).
Write different function, can achieve different sort algorithm (3 kinds of above), and then write a general output function, (with) function Pointers can do parameters were printed different sort algorithm.