Recursion in C++ - Binary Search - Computer Science Assessment Answer

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Assessment Task:

This is a programming contest type of problem-solving problem. In computer science, binary search is a search algorithm that finds the position of a target value within a sorted array. Binary search compares the target value to the middle element of the array. If they are not equal, the half in which the target cannot lie is eliminated and the search continues on the remaining half, again taking the middle element to compare to the target value, and repeating this until the target value is found. If the search ends with the remaining half being empty, the target is not in the array. 
I. Write a recursive function with the following function declaration 
int binary_search(int val, int list[], int low, int high); 
which searches the values in the "list[]" array from "list[low]" to "list[high]" to find an array element with value "val". If it finds "val", it returns the position of "val" in the "list[]". Otherwise it returns -1.  
II. As binary search works only on a sorted array, you are required to write a recursive quicksort function to sort the elements of the array before performing a binary search.   The declaration of this function is as follows: 
void quick_sort(int list[MAX], int low, int high); 
III. Test your functions in a suitable main program. You are required to enter the elements of the array of arbitrary size and search for an element in the array using a recursive binary search algorithm.

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