Change output sum, add output subtraction

main.cpp

@@ -5,10 +5,10 @@ using namespace std;
 int main()
 {
     cout << "Enter A and B: " << endl;
-    int a, b, sum;
+    int a, b;
     cin >> a >> b;
-    sum = a + b;
-    cout << "Sum of A and B: " << sum << endl;
+    cout << "A + B = " << a + b << '\n'
+     << "A - B = " << a - b << '\n';
 
     std::cout << "Press 'Enter' for exit...";
     std::cin.ignore(); // èãíîðèðóåì ñèìâîë íîâîé ñòðîêè èç ïðåäûäóùåãî ââîäà