merge branch 'double'

merge

main.cpp

@@ -5,7 +5,7 @@ using namespace std;
 int main()
 {
     cout << "Enter A and B: ";
-int a, b;
+double a, b;
 cin >> a >> b;
 cout << "A + B = " << a + b << '\n'
      << "A - B = " << a - b << '\n'