Write a recursive lookup function to search an array in sorted order.?

Write a program in C to test your function. Use random() to fill array a[] of size n, and use bubble_sort() to sort the array. The function call look_up(v, a, n) should be used to look for the value v in the array a[]. If just one of the elements of the array, say a[i] has the value v, then i should be returned. If two or more of the elements of the array have the value v, then the index of any one of them in an acceptable answer.