Write C++ program using STL to add binary numbers (assume one bit as one number)

/*

Problem statement:
Write C++ program using STL to add binary numbers (assume one bit as one number); use
STL stack.
*/

#include<iostream>
#include<stack>
using namespace std;

int main()
{
int n1,n2,n,num,num1,num2,carry,ele;
stack <int> s1;
stack <int> s2;
stack <int> s3;
carry=0;
cout<<"Please enter number of bits of first number:\t";
cin>>n1;
cout<<"Please enter number of bits of second number:\t";
cin>>n2;
if(n1>n2)
    {
        n=n1-n2;
        for(int i=0;i<n;i++)
        {
            s2.push(0);
        }
    }
    else if(n2>n1)
    {
       n=n2-n1;
        for(int i=0;i<n;i++)
        {
            s1.push(0);
        }
    }
cout<<"\nNote:Enter number bit by bit\n";
cout<<"\nEnter first number : ";
for (int i = 0; i < n1; ++i)
{
cin>>num;
s1.push(num);
}

cout<<"\nEnter second number : ";
for (int i = 0; i < n2; ++i)
{
cin>>num;
s2.push(num);
}

while(!s1.empty() && !s2.empty())
{
num1=s1.top();
num2=s2.top();
s1.pop();
s2.pop();
if(num1 + num2 + carry==0)
{
ele=0;
carry=0;
}
else if(num1 + num2 + carry==1)
{
ele=1;
carry=0;
}
else if(num1 + num2 + carry==2)
{
ele=0;
carry=1;
}
else if(num1 + num2 + carry>2)
{
ele=1;
carry=1;
}
s3.push(ele);
}
if(carry==1)
s3.push(carry);
cout<<"\nThe addition of entered two binary numbers is : ";
while(!s3.empty())
{
ele=s3.top();
s3.pop();
cout<<ele;
}
cout<<"\n";
return 0;
}

/*
OUTPUT:
Please enter number of bits: 4

Note:Enter number bit by bit

Enter first number : 1 1 1 1

Enter second number : 1 1 1 1

The addition of entered two binary numbers is : 11110
comp-sl2-26@comp-sl2-26:~/Desktop$
*/