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Commit 337ce10

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Binary_Search_Iter_Recur.cpp
Contains both Iterative and Recursive method for Binary Search. This solves fnplus#65 
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#include <stdio.h>
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//Recursive Method
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int binarySearchR(int arr[], int l, int r, int x)
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{
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if (r >= l) {
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int mid = l + (r - l) / 2;
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if (arr[mid] == x)
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return mid;
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if (arr[mid] > x)
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return binarySearchR(arr, l, mid - 1, x);
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return binarySearchR(arr, mid + 1, r, x);
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}
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return -1;
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}
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//Iterative Method
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int binarySearchI(int arr[], int l, int r, int x)
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{
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while (l <= r) {
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int m = l + (r - l) / 2;
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if (arr[m] == x)
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return m;
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if (arr[m] < x)
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l = m + 1;
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else
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r = m - 1;
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}
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return -1;
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}
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int main(void)
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{
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int n;
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printf("Size : ");
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scanf("%d",&n);
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int arr[n];
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for(int i=0;i<n;i++)
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scanf("%d",&arr[i]);
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int op;
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printf("Enter choice : \n 1. Recursive Method \n 2. Iterative Method ");
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scanf("%d",&op);
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int x;
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printf("Value to search : ");
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scanf("%d",&x);
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int result;
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if(op==1)
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result = binarySearchR(arr, 0, n - 1, x);
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else
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result = binarySearchI(arr, 0, n - 1, x);
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(result == -1) ? printf("Element is not present in array") : printf("Element is present at index %d", result);
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return 0;
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}

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