Simple Binary Searching Program using functions in C++

Definition

Binary search is a quickest search algorithm that finds the position of a target value within a sorted array

Also Called,

• half-interval search
• logarithmic search
• binary chop

Simple Binary Searching Program using functions

/* Simple Binary Search Program Using Functions in C++*/
/* Data Structure C++ Programs,C++ Array Examples */

#include <iostream>
#include<conio.h>
#include<stdlib.h>

#define MAX_SIZE 5

using namespace std;

void binary_search(int[], int);

int main() {
    int arr_search[MAX_SIZE], i, element;

    cout << "Simple C++ Binary Search Example - Array and Functions\n";
    cout << "\nEnter " << MAX_SIZE << " Elements for Searching : " << endl;
    for (i = 0; i < MAX_SIZE; i++)
        cin >> arr_search[i];

    cout << "\nYour Data   :";
    for (i = 0; i < MAX_SIZE; i++) {
        cout << "\t" << arr_search[i];
    }

    cout << "\nEnter Element to Search : ";
    cin>>element;


    binary_search(arr_search, element);
    getch();
}

void binary_search(int fn_arr[], int element) {
    int f = 0, r = MAX_SIZE, mid;

    while (f <= r) {
        mid = (f + r) / 2;

        if (fn_arr[mid] == element) {
            cout << "\nSearch Element  : " << element << " : Found :  Position : " << mid + 1 << ".\n";
            break;
        } else if (fn_arr[mid] < element)
            f = mid + 1;
        else
            r = mid - 1;
    }

    if (f > r)
        cout << "\nSearch Element : " << element << "  : Not Found \n";

    getch();
}

Sample Output

Simple Binary Search Example - Array and Functions

Enter 5 Elements for Searching :
1001
1020
3002
4001
5000
Enter Element to Search : 3002

Search Element  : 3002  : Found :  Position : 3.