...

main.cpp

@@ -4,6 +4,10 @@ using namespace std;
 
 int main()
 {
-    cout << "Hello world!" << endl;
+cout << "Enter A and B: ";
+int a, b;
+cin >> a >> b;
+cout << "A + B = " << a + b << '\n'
+     << "A - B = " << a - b << '\n';
     return 0;
 }