code: add product

main.cpp

@@ -8,5 +8,6 @@ int main()
     int a, b;
     cin >> a >> b;
     cout << "A + B = " << a + b << '\n'
-         << "A - B = " << a - b << '\n';
+         << "A - B = " << a - b << '\n'
+         << "A * B = " << a * b << '\n';
 }