Binary Search


/*******************************************************************************/
#include <stdio.h>

int binarySearch(int arr[], int n, int target) {
    int left=0,right=n-1,mid;
    while (left <= right) {
        mid = left + (right - left) / 2;
        
        if (arr[mid] == target) {
            return mid; // Target found, return its index
        }
        
        if (arr[mid] < target) {
            left = mid + 1; // Target is in the right half
        } else {
            right = mid - 1; // Target is in the left half
        }
    }
    
    return -1; // Target not found
}

int main() {
    int i,n,arr[50],target,result;
printf("Enter number of elements :: ");
scanf("%d",&n);

printf("\nEnter %d elements in sorted order:: \n", n);
for ( i = 0 ; i < n ; i++ )
{
scanf("%d",&arr[i]);
}

printf("\nEnter key value to search :: ");
scanf("%d",&target);
result = binarySearch(arr, n, target);
    
    if (result != -1) {
        printf("Element %d found at index %d.\n", target, result);
    } else {
        printf("Element %d not found in the array.\n", target);
    }
    
    return 0;
}

/*******************************************************************************/
/* Recursive Implementation of Binary Search */
#include <stdio.h>

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

        if (arr[mid] == target) {
            return mid; // Target found, return its index
        }

        if (arr[mid] < target) {
            return binarySearch(arr, mid + 1, right, target); // Search in the right half
        } else {
            return binarySearch(arr, left, mid - 1, target); // Search in the left half
        }
    }

    return -1; // Target not found
}


int main() {
    int i,n,arr[50],target,result;
printf("Enter number of elements :: ");
scanf("%d",&n);

printf("\nEnter %d elements in sorted order:: \n", n);
for ( i = 0 ; i < n ; i++ )
{
scanf("%d",&arr[i]);
}

printf("\nEnter key value to search :: ");
scanf("%d",&target);
result = binarySearch(arr, 0,n-1, target);
    
    if (result != -1) {
        printf("Element %d found at index %d.\n", target, result);
    } else {
        printf("Element %d not found in the array.\n", target);
    }
    
    return 0;
}

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