Do You Know Everything About Objective-C?

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| By K_Enidaa

K_Enidaa

Community Contributor

Quizzes Created: 15 | Total Attempts: 4,973

| Attempts: 125

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1/10 Questions

What's the filename extension for implementation program files?
- .m
- .o
- .e
- .a

About This Quiz

Back then in the 1980s, Objective-C was Apple's pride and joy. Times have changed, but the significance of Objective-C hasn't faded. Today, we're testing your knowledge on this general-purpose, object-oriented programming. Let's see are you an Objective-C expert!

Do You Know Everything About Objective-c? - Quiz

2.

Where does Objective-C derive its object syntax from?
- Smalltalk
- Smallwatch
- Smallpage
- Smalltab
Correct Answer

A. Smalltalk

Explanation

Objective-C derives its object syntax from Smalltalk. Smalltalk is an object-oriented programming language that was developed in the 1970s. Objective-C, which was created in the 1980s, borrowed many of its object-oriented features and syntax from Smalltalk. This includes concepts such as message passing, dynamic typing, and the use of square brackets for method calls. By incorporating Smalltalk's object syntax, Objective-C was able to provide a powerful and flexible programming language for developing software applications.

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3.

What's Objective-C model of object-oriented programming based on?
- Message deleting during testing
- Message passing to object instances
- Message creating to object instances
- Message modifying during testing
Correct Answer

A. Message passing to object instances

Explanation

Objective-C model of object-oriented programming is based on message passing to object instances. In Objective-C, objects communicate with each other by sending messages. When a message is sent to an object, the object's method corresponding to that message is executed. This allows objects to interact and collaborate with each other, forming the basis of object-oriented programming in Objective-C.

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4.

Which protocols does Objective-C use?
- New and old protocols
- Regular and strange protocols
- Informal and formal protocols
- Slow and fast protocols
Correct Answer

A. Informal and formal protocols

Explanation

Objective-C uses both informal and formal protocols. Informal protocols are a way to define a set of methods that objects can choose to implement, providing a flexible way to extend functionality. Formal protocols, on the other hand, are a more structured approach where a set of methods must be implemented by conforming objects. By supporting both types of protocols, Objective-C allows developers to choose the level of flexibility and structure they need in their code.

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5.

What's "Objective-C without the C"?
- Saw
- Swing
- Swirl
- Swift
Correct Answer

A. Swift

Explanation

Swift is the correct answer because it is known as "Objective-C without the C." Swift is a programming language developed by Apple that is designed to be more modern, safe, and easier to use than Objective-C. It is compatible with Objective-C and can be used alongside it in iOS and macOS development. Swift eliminates the need for many of the complex and error-prone features of Objective-C, making it a more streamlined and efficient language for developing applications.

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6.

What does syntax allow?
- Writing the test in any language you want
- Changing the code
- Pseudo-naming of arguments
- Changing the syntax's color
Correct Answer

A. Pseudo-naming of arguments

Explanation

Syntax allows for the pseudo-naming of arguments. This means that when writing code, you can use descriptive names for the arguments instead of the actual variable names. This can make the code more readable and easier to understand for both the programmer and other individuals who may need to work with the code. Pseudo-naming of arguments is a feature provided by the syntax of programming languages.

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7.

Which statement is true?
- You need to know a specific language to read Objective-C's messages
- Objective-C sends only encrypted messages
- Objective-C isn't capable of sending messages
- Objective-C can send messages to an object that may not respond
Correct Answer

A. Objective-C can send messages to an object that may not respond

Explanation

Objective-C can send messages to an object that may not respond. This means that Objective-C allows for the sending of messages to an object without requiring the object to have a defined response or method implementation. This flexibility allows for dynamic messaging and handling of potential errors or unexpected scenarios in Objective-C programming.

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8.

What was Objective-C for Apple back in the 1980s?
- A language that wasn't used at all
- A language that was stolen from Apple's opponent
- Apple's second created language
- Apple's main programming language
Correct Answer

A. Apple's main programming language

Explanation

Objective-C was Apple's main programming language in the 1980s. It was not a language that wasn't used at all or stolen from Apple's opponent. It was also not Apple's second created language. Objective-C was widely used by Apple for developing software and applications during that time period.

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9.

What do you use to write methods?
- Parts of codes
- Numbers and symbols
- A specific language written for the specific test
- Interface declarations
Correct Answer

A. Interface declarations

Explanation

Interface declarations are used to define methods in programming. An interface is a collection of abstract methods that can be implemented by classes. By using interface declarations, programmers can define the methods that need to be implemented by a class, without specifying how they should be implemented. This allows for code reusability and ensures that classes implementing the interface have the required methods. Therefore, interface declarations are the correct choice for writing methods.

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10.

What is posing?
- Permitting a class to replace another class withing a program
- Replacing a platform on which you perform the testing
- Allowing access to hidden files
- Recording and playing testing process
Correct Answer

A. Permitting a class to replace another class withing a program

Explanation

Posing refers to the act of allowing a class to replace another class within a program. This means that one class can take on the functionality and behavior of another class, providing flexibility and customization options within the program. This concept is often used in object-oriented programming to facilitate easier modifications and updates to the program's code.

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