Program for Binary Search in CPP

Binary.cpp

#include<iostream>
using namespace std;
int main()
{
    int a,n,num,i,mid,beg,end;
    cout<<"Enter size of array :";
    cin>>n;
    int arr[n];
    cout<<"Enter array elements :";
    for(i=0;i<n;i++)
    {
        cin>>arr[i];
    }
    cout<<"Enter element to search :";
    cin>>num;
    end=n-1;
    mid=(beg+end)/2;
    while(beg<=end)
    {
        if(arr[mid]<num)
        {
            beg=mid+1;
        }
        else if(arr[mid]==num)
        {
            cout<<num<<" found at "<<mid+1;
            break;
        }
        else
        {
            end=mid-1;
        }
        mid=(beg+end)/2;
    }
    if(beg>end)
    {
        cout<<"Not found";
    }
}