Introduction - If you have any usage issues, please Google them yourself
The return problem of the array as a function parameter is returned to a pointer,
1 correct method: pass the first address of the memory and the effective length of the array to the called function
2 / / a array data type of the a parameter and the essence of the argument is not the same as the parameter, the compiler will use it as a pointer processing this is the essence of the C language features analysis sorting
The 3 parameter is written in a function that is the same as written in a function, but it is only a foreign attribute.