Added binary search in C (hacktoberfest17#1166)

Author: santhoshsamy29

binary_search/c/binary_search.c

@@ -0,0 +1,32 @@
+#include<stdio.h>
+
+int binarySearch(int arr[], int l, int r, int x)
+{
+   if (r >= l)
+   {
+        int mid = l + (r - l)/2;
+ 
+        if (arr[mid] == x)  return mid;
+ 
+        if (arr[mid] > x) return binarySearch(arr, l, mid-1, x);
+ 
+        return binarySearch(arr, mid+1, r, x);
+   }
+   return -1;
+}
+ 
+int main(void)
+{
+   int arr[10],i,x;
+   printf("Enter the elements of the array : \n");
+   for(i=0 ; i<10 ; i++){
+   	scanf("%d",&arr[i]);
+   }
+   int n = sizeof(arr)/ sizeof(arr[0]);
+   printf("Enter the element to be searched : \n");
+   scanf("%d",&x);
+   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;
+}