Binary search program in c using array

It is akin to saying, I have a solution, but now I have to figure out how someone else solved it assuming that they didn't make any mistakes, and assuming that they had the exact same requirements as you. The high and low variables represent the current range you are searching. You usually start with the beginning and end of the array, and then determine if the value is in the first or second half, or exactly in the middle.

If it is in the middle, you return that point. If it is below the middle, you search again recursively , but now only in the lower half. If it is above the middle, you search the upper half. And you repeat this, each time dividing up and narrowing the range. If you find the value, you return, otherwise, if the range is so narrow that it is empty both low and end high indexes are the same , you didn't find it.

High and low are upper and lower bounds on the candidate indices of the array. In other words, they define the portion of the subarray in which it is possible for the search target to exist.

Since the size of the subarray is cut in half each iteration, it is easy to see that the algorithm is O log n. On your current code, first of all, n should not be in parentheses it doesn't make a difference, but it confuses me. Next up, if it's meant to be returning the index in the array, your code doesn't do that, it returns 1. Check prime number. Find the factorial of a number. Print the Fibonacci sequence. Check leap year. DSA Introduction What is an algorithm?

Related Topics Linear Search. Binary Search In this tutorial, you will learn how Binary Search sort works. In this approach, the element is always searched in the middle of a portion of an array. Binary Search Working Binary Search Algorithm can be implemented in two ways which are discussed below.

Disclosure: Hackr. When you purchase through links on our site, we may earn an affiliate commission. A binary search is a simplistic algorithm intended for finding the location of an item stored in a sorted list. There are a few variations to the binary search in C program, such as testing for equality and less-than at each step of the algorithm. Binary search in C is an example of a simple process that can be used to dissolve complex problems. As such, it is an important foundational concept that you will find in almost all the good books on the C programming language.

Binary search algorithm applies to a sorted array for searching an element. The search starts with comparing the target element with the middle element of the array. If value matches then the position of the element is returned. In case the target element is less than the middle element considering the array follows an ascending order of the array then the second half of the array is discarded and the search continues by dividing the first half.

The process is the same when the target element is greater than the middle element, only, in this case, the first half of the array is discarded before continuing with the search. The iteration repeats until a match for the target element is found. The following code implements binary search in C programming language. Otherwise, the index value is returned. This is given below. Chandu yadav.

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