CPP program to implement binary search in an array

Source Code:

#include<iostream>
using namespace std;
int main()
{
int count,i,arr[30],num,first,last,middle;
cout<<"how many elements would you like to enter?: ";
cin>>count;
for(i=0;i<count;i++)
{
cout<<"Enter number"<<(i+1)<<":";
cin>>arr[i];
}
cout<<"Enter number that you want to search: ";
cin>>num;
first=0;
last=count-1;
middle=(first+last)/2;
while(first<=last)
{
if(arr[middle]<num)
{
first=middle+1;
}
else if(arr[middle]==num)
{
cout<<num<<" "<<"found in the array at the location"<<" "<<middle+1<<"\n";
break;
}
else
{
last=middle-1;
}
middle=(first+last)/2;
}

if(first>last)
{
cout<<num<<" "<<"not found in the array";
}

return 0;
}

Program Output: