Harshil's Blog

Binary Search in C

April 09, 2020

// C program to implement recursive Binary Search

include <stdio.h>

// A recursive binary search function. It returns // location of x in given array arr[l..r] is present, // otherwise -1 int binarySearch(int arr[], int l, int r, int x) { if (r >= l) { int mid = l + (r - l) / 2;

	// If the element is present at the middle
	// itself
	if (arr[mid] == x)
		return mid;

	// If element is smaller than mid, then
	// it can only be present in left subarray
	if (arr[mid] > x)
		return binarySearch(arr, l, mid - 1, x);

	// Else the element can only be present
	// in right subarray
	return binarySearch(arr, mid + 1, r, x);
}

// We reach here when element is not
// present in array
return 0;

}

int main(void) { int arr[] = { 2, 3, 4, 10, 40 }; int n = sizeof(arr) / sizeof(arr[0]); int x = 10; int result = binarySearch(arr, 0, n - 1, x); (result == -1) ? printf(“Element is not present in array”) : printf(“Element is present at index %d”, result); return 0; }

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