C++ Program - Swapping Two Integers

#include
using namespace std;
int main() {
    int number1,number2;
cout<<"Enter 1st No. ";
    cin>>number1;
cout<<"Enter 2nd NO ";
    cin>>number2;
    cout<<"Before Swapping ";
cout< number1 = number1 + number2;
number2 = number1 - number2;
number1 = number1 - number2;
cout<<"After Swapping ";
cout<    return 0;
}