Programming Basics

What is the purpose of a loop in programming?

• To play music in the background

• To make the code more colorful

• To confuse the programmer

• To repeatedly execute a block of code until a certain condition is met or for a specific number of iterations.

What is the difference between '==' and '===' operators in JavaScript?

• '==' performs type coercion, while '===' does not.

• '==' is used for comparing numbers, while '===' is used for comparing strings.

• '==' is a strict comparison operator, while '===' is a loose comparison operator.

• '==' checks for value equality only, while '===' checks for both value and type equality.

Explain the concept of inheritance in object-oriented programming.

• Inheritance is a mechanism where a class inherits properties from an interface.

• Inheritance is a mechanism where a class inherits properties from a subclass.

• Inheritance is a mechanism where a new class inherits properties and methods from an existing class, known as the base class or parent class.

• Inheritance is a mechanism where a class inherits properties from an abstract class.

What is the role of a compiler in programming?

• Generates test cases for software testing

• Creates user interfaces for software applications

• Translates high-level programming code into machine code

• Optimizes code for better performance

What is the significance of 'public', 'private', and 'protected' keywords in Java?

• They are data types in Java

• They are used for error handling in Java

• They are used for looping in Java

• They are access modifiers used to control visibility in Java.

What is the difference between 'int' and 'float' data types?

• The main difference between 'int' and 'float' data types is that 'int' represents whole numbers, while 'float' represents numbers with decimal points.

• Int and float are interchangeable in programming languages

• Int is used for text data while float is used for numerical data

• Int can store larger values than float

Explain the difference between 'function declaration' and 'function expression' in JavaScript.

• Function declaration is used for asynchronous functions, while function expression is used for synchronous functions.

• Function declaration uses arrow functions, while function expression uses regular functions.

• Function declaration defines a function using the function keyword, while function expression assigns a function to a variable.

• Function declaration can only be used within classes, while function expression can be used globally.

What is the use of 'try', 'catch', and 'finally' blocks in exception handling?

• They are used to print error messages

• They are used to skip code execution

• They are used to increase code efficiency

• They are used in exception handling to try a block of code, catch any exceptions that occur, and execute final cleanup tasks.

What is the purpose of 'git' in version control systems?

• Git is used for creating new programming languages

• Git is primarily used for designing user interfaces

• Git is a tool for testing software applications

• Git helps in tracking changes, collaborating with others, and managing different versions of the codebase.

Explain the concept of 'recursion' in programming.

• Recursion is a technique where a function calls another function to solve a problem.

• Recursion in programming is a technique where a function calls itself in order to solve a problem.

• Recursion is only used in object-oriented programming.

• Recursion involves using loops to iterate through a problem.