How does 1 address line give you 2 bytes of data? [closed] - cpu-architecture

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In the quora answer: https://www.quora.com/How-many-number-of-address-lines-is-needed-for-processor-to-access-4MB-memory - the top answer starts with 1 address line giving you 2 bytes of data. But my question is how mathematically?

A single address line can be in one of two states - either in state 0 or 1, hence it is able to address two distinct locations.

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The body might complete normally causing null to be returned but the return type is a potentially non nullable type [closed]

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What did I do wrong?
Thanks for the help
You need to return buildHome() in your default case like the other cases.

How do you represent either / or within a use case diagram? [closed]

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I am making a use case diagram for a school and was wondering how I can show a degree course is either full time or part time and then each degree contains 1 to 10 courses.
Thanks!
The rules you are giving in your question are not captured in the use case model, but in the domain model. The description of a use case is influenced by the domain model. Like for example a use case enroll for term will describe steps where the user enters one or more courses. For a domain model you would create a class diagram.

JCL/REXX - Members in a PDS [closed]

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How can I create a member in a PDS using either JCL or REXX? The member's name must contain the actual date. Is that possible?
It can be done in JCL and by Rexx. You need to remember that member names are a maximum of 8 bytes and cannot start with a numeric so you would need to use something like the 'Julian' date e.g. 2017365. You may have system variables available to populate your JCL - check the JCL manual and level of Z/os that you are using.

observing two children from a database in swift from firebase [closed]

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Is there an effective way to observe two nodes at once from firebase? Could you write sample code for it if possible?
Put call for the second node in the completionBlock of the first one:
For example i have my user's location coordinates(lat and lng) stored in two node's stored under my UserId:-
ref.child(FIRAuth.auth()!.currentUser!.uid).child("latitude").observeEventType(.Value, withBlock: {(SnapshotLAT) in
ref.child(FIRAuth.auth()!.currentUser!.uid).child("longitude").observeEventType(.Value, withBlock: {(SnapshotLNG) in
.....
.....
})
})
Maybe i could help you more if you posted your JSON structure here....

RESTful URL design - how to query using OR parameters [closed]

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How would you design a RESTful query to support OR and AND operand between parameters. Let's say my resource has three fields field1 & field2 &field3. How would you design the URL to enable the following query:
"Get myresources where field1=x OR field2=y AND field3=z"
I would probably encode a normal form (eg. CNF) of the relation between the fields somehow. For example:
http://myurl.com/get_myresources?field1=x&field2=y&field3=z&relationcnf=1OR2AND3