Binary Search in C++|| Binary search algorithm || Binary Search in C program

Binary Search in C++

Binary search is one of the most fundamental and effective searching methods in the field of computer science and algorithms. It is frequently utilized in many applications where sorted data is arranged. We will go into the world of Binary Search in C++ algorithms in this post, examining its ideas, applications, and effectiveness.

What does the C++ Binary Search Algorithm do?

An effective approach for locating a target value’s location within a sorted array is binary search. With each iteration, the algorithm uses a divide-and-conquer strategy to cut the search space in half, making it extremely effective for big datasets.

The Binary Search Process

Data input: The input data must be arranged in either ascending or descending order in order to do a binary search. Assume we have a target value target and a sorted array called arr that we are trying to find.

Setting two pointers, left and right, to the first and last members of the array, respectively, initiates the binary search process. (Left + Right) / 2 is another formula for calculating the midpoint.

Comparison: We contrast the element at the midpoint arr[mid] with the goal value target. Three scenarios are possible:

step 1:If target equals arr[mid], the search has successfully located the requested element.

Step 2: The target value must be in the left side of the array if target is less than arr[mid].In order to search in the left sub-array, we update right = mid – 1.

step 3:Target must be in the right half of the array if it is greater than arr[mid]. So, to search in the right sub-array, we update left = mid + 1.

Iterative Method: Until the target element is located or until left exceeds right, indicating that the element is absent from the array, steps 2 and 3 are repeated.

Output: The binary search provides the index of the target element if it is located; else, it returns a special value (for example, -1) to denote that the element is absent from the array.

Implementing Binary Search in C++

#include <iostream>
using namespace std;

int binarySearch(int arr[], int left, int right, int target) {
    while (left <= right) {
        int mid = left + (right - left) / 2;

        if (arr[mid] == target)
            return mid;

        if (arr[mid] < target)
            left = mid + 1;
            right = mid - 1;

    return -1;

int main() {
    int arr[] = {2, 4, 6, 8, 10, 12, 14, 16};
    int n = sizeof(arr) / sizeof(arr[0]);
    int target = 10;

    int result = binarySearch(arr, 0, n - 1, target);//Binary Search in C++

    if (result != -1)
        cout << "Element found at index: " << result << endl;
        cout << "Element not found in the array." << endl;

    return 0;

The Efficiency of Binary Search

A very effective technique, binary search has a temporal complexity of O(log n), where n is the number of entries in the array. Due to this, binary search is much quicker than linear search, which has an O(n) time complexity. This is especially true for large datasets. As binary search divides the search space in half continually, it eliminates half of the remaining elements with each iteration, making the search process noticeably faster.

What are the prerequisites for using the binary search algorithm in C++?

The most crucial criterion for using the binary search algorithm in C++ is that the data must be sorted. The binary search will function effectively as long as the data is arranged in a particular way, whether the array is sorted in ascending order or descending order. A fundamental familiarity with C++ programming, arrays, and looping structures is also required.

Can binary search be used on non-numeric data?

Yes, binary search can be used on non-numeric data as well, as long as the data is sorted based on some criteria. For example, if you have a sorted array of strings, you can perform binary search to find a specific string efficiently. The algorithm’s underlying principle of dividing the search space in half remains applicable to any data type that can be compared for ordering.

Is binary search suitable for all types of datasets?

The most effective use of binary search is for static, rarely changing databases. It is quite effective for searching in arrays, but it might not be the ideal option for dynamic datasets with often added or removed elements. When elements are added or removed, the sorted order may be disrupted, necessitating extra actions to keep it intact. Other search methods, like hash tables or balanced binary search trees, may be more appropriate in these circumstances.


Searching for particular elements within sorted arrays is made simple and efficient using binary search methods in C++. Binary search ensures an effective search method with a time complexity of O(log n) by splitting the search space in half with each iteration. Understanding that data must be sorted before the binary search method can be applied is essential. Binary search may substantially accelerate searching operations and improve the overall performance of your C++ programs when used properly. Greetings from the code!

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