Exercise 3.8. Write a function to compute the minimum and maximum values of an integer array. It should implement the following specification: 1 /* Computes the minimum and maximum elements of the array 2 * a of length n, storing them in the memory cells to which 3 * min and max , respectively , point. Returns 0 if 4 * successful; -1 if one or more of a, min , or max is NULL; 5 * and -2 if n <= 0. 6 */ 7 int minmax(int * a, int n, int * min , int * max);

Implement a unit test of minmax in a main function.