Java: Find a Fixed Point (Value equal to Index) in given Array

Difficulty Level: MEDIUM

Problem Statement:

Given an array of n distinct integers sorted in ascending order, write a function that returns a Fixed Point in the array, if there is any Fixed-Point present in the array, else returns -1. Fixed Point in an array is an index i such that arr[i] is equal to i.

Note that integers in the array can be negative.

Input:

arr[] = {-10, -5, 0, 3, 7}

Output:

3 //arr[3] == 3