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Binary Search Algo Imlementation
C++
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// Compiled using g++/gcc
#include <stdio.h>
#include <stdlib.h>
#include <stdio.h>
 
int  BinarySearch(int* arr, int first, int last, int key){
    int mid=(first+last)/2;
    if(first>last)
        return 0;
    if(arr[mid]<key)
    BinarySearch(arr,mid+1,last,key);
    else if(arr[mid]==key)
    {
        return (mid+1);
    }
    else
        BinarySearch(arr,first,mid-1,key);
 
}
int BInarySearchItr(int* array,int first,int last, int search)
{
    int middle = (first+last)/2;
 
       while (first <= last) {
          if (array[middle] < search){
             first = middle + 1;
          }
          else if (array[middle] == search) {
              return middle+1;
            
          }
          else
          last = middle - 1;
          middle = (first + last)/2;
       }
 
 
}
int main()
{
   int c, first, last, middle, n, search, array[100];
 
   printf("Enter number of elements\n");
   scanf("%d",&n);
 
   printf("Enter %d integers\n", n);
 
   for (c = 0; c < n; c++)
      scanf("%d",&array[c]);
 
   printf("Enter value to find\n");
   scanf("%d", &search);
 
   first = 0;
   last = n - 1;
  int pos= BinarySearch(array,first,last,search);
  printf("%d found at location %d.\n", search, pos);
  printf("Search By Iterative method\n");
  int pos1=BInarySearchItr(array,first,last, search);
  printf("%d found at location %d.\n", search, pos1);
 
   return 0;
}

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