Interview Questions Answers in Core Java, C++ General, Unix General, C Sharp, Python

Can a constructor return a value?

Answer

It is possible for a constructor to return a value. A constructor cannot explicitly return a value; instead, it implicitly replaces the current instance of the class.

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Question { 1257 }

What is an object in c++?

Answer

Real-world entities with a state (some type of data) and behavior (functionality) are called objects. A class consists of connected things.

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Question { 1525 }

What are the main features of unix?

Answer

Key features of Unix include:
• Multiuser Capability: Multiple users can access the system simultaneously.
• Multitasking: Unix can execute multiple tasks concurrently.
• Portability: Unix can run on various hardware platforms.
• Security: Unix has robust security features, including file permissions and user authentication.
• Hierarchical File System: Organizes files and directories in a tree structure.
• Shell: An interactive command-line interpreter that allows users to interact with the system.

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Question { 1522 }

What is a lambda expression in c#?

Answer

• An anonymous function introduced in C++11, defined as:
• [capture_list](parameters) -> return_type { body }

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Question { 1466 }

What is a volatile variable in c++?

Answer

A volatile variable indicates to the compiler that the variable can be changed at any time, preventing optimizations.

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Question { 676 }

What is the difference between a Mutable datatype and an Immutable data type?

Answer

Data types that are mutable can be altered at runtime. For instance, a dictionary, list, etc.
Immutable data types cannot be changed at runtime, so they cannot be altered. For instance, String, Tuple, etc.

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Question { 1429 }

How are arguments passed by value or by reference in Python?

Answer

In Python, everything is an object, and references to the objects are stored in all variables. You are unable to alter the reference values because they are determined by the functions. However, if the item is malleable, you can alter it.

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Question { 1429 }

How are arguments passed by value or by reference in Python?

Answer

In Python, arguments are passed by assignment, meaning that the reference to an object is passed to the function. Immutable types (like integers, strings, tuples) behave like "pass-by-value" because their content cannot be modified, while mutable types (like lists, dictionaries) behave like "pass-by-reference" because their content can be modified.

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Question { 593 }

What is the difference between a Set and Dictionary?

Answer

Iterable, mutable, and devoid of duplicate elements, the set is an unordered collection of data types.
Similar to a map, a dictionary in Python is an ordered collection of data values that are used for data value storage.

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Question { 633 }

Difference between for loop and while loop in Python

Answer

It is common practice to iterate through the items of different collection types, including List, Tuple, Set, and Dictionary, using the "for" loop. Developers employ a "for" loop in which the conditions are both the beginning and the conclusion. In contrast, the true looping feature found in all other programming languages is the "while" loop. Python while loops are used by programmers when they only have end conditions.

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Question { 635 }

1 What is Python?

Answer

Python is a popular high-level, general-purpose programming language. Guido van Rossum invented it in 1991, and the Python Software Foundation continued to refine it.

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Question { 1484 }

What does the ‘#’ symbol do in Python?

Answer

‘#’ is used to comment on everything that comes after on the line

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Question { 1484 }

What does the ‘#’ symbol do in Python?

Answer

The `#` symbol is used to add comments in Python. Comments are not executed and are intended to explain the code for the benefit of developers.
Example:
python
# This is a comment

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Question { 788 }

Python a compiled language or an interpreted language?

Answer

Python is actually a partially interpreted and partially compiled language. When we run our code, the compilation process begins. This creates byte code internally, which the Python virtual machine (p.v.m.) then converts based on the underlying platform (computer + operating system).

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Question { 862 }

Is Python object-oriented or functional programming?

Answer

Python is functional as well as object-oriented. By permitting the construction of classes and objects, encapsulation, inheritance, and polymorphism, it facilitates object-oriented programming, or OOP. Functional programming concepts like lambda expressions, list comprehensions, higher-order functions, and first-class functions are also supported by Python. Python is a multi-paradigm language because of its versatility, which allows developers to employ functional, OOP, or a combination of both approaches depending on the task.

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