说明：  请编写一个函数void fun(int m,int k,int xx[]),该函数的功能是：将大于整数m且紧靠m的k各素数存入xx所指的数组中。
(Please write a function void fun (int m, int k, int xx []), this function is the function: will be greater than integers m and k m, close to the prime numbers stored in the array referred xx.)