Reducing to three lines (the other errors are analogous): While wall is defined, gallons is not. And where do you want to get gallons from anyway? The result is hidden deep inside another function. How do you want to get it out from there? Well, you need a return value: This way, you can use your function like this: Analogously for … Read more
No, the replacement is: However, wanting to use this construct is a sign of overly complicated code flow. Usually, you’d do the following: and never be unsure whether v is set or not. If it’s one of many options that can either be set or not, use a dictionary and its get method which allows a default value
This is because Point is a value type (struct). Because of this, when you access the Origin property you’re accessing a copy of the value held by the class, not the value itself as you would with a reference type (class), so if you set the X property on it then you’re setting the property on the copy and then discarding it, leaving … Read more