10+ Hindustan Petroleum Interview Questions and Answers

Loops, arrays, and conditional statements are fundamental programming concepts.

• Loops allow for repetitive execution of code based on a condition or a set number of iterations.

• Arrays are collections of data that can be accessed and manipulated using an index.

• Conditional statements allow for the execution of different code based on a specified condition.

• Examples: for loop, while loop, do-while loop, if statement, switch statement, foreach loop.

I am comfortable with Java, Python, and C++.

• Proficient in Java with experience in developing web applications using Spring framework

• Skilled in Python for data analysis and machine learning projects

• Familiar with C++ for competitive programming and algorithm development

Switch is a control statement used to select one of many code blocks to be executed.

• Switch statement evaluates an expression and compares it with multiple cases

• If a match is found, the code block associated with that case is executed

• If no match is found, the default code block is executed

• Example: switch(expression) { case 1: //code block; break; case 2: //code block; break; default: //code block; }

I am comfortable with OOPS programs such as Java, C++, and Python.

• Proficient in Java OOPS concepts such as Inheritance, Polymorphism, and Encapsulation

• Familiar with C++ OOPS concepts such as Abstraction, Constructors, and Destructors

• Experienced in Python OOPS concepts such as Classes, Objects, and Inheritance

A data structure is a way of organizing and storing data in a computer so that it can be accessed and manipulated efficiently.

• Data structures provide a means to manage and organize data effectively.

• They define the relationship between data elements and enable operations to be performed on the data.

• Examples of data structures include arrays, linked lists, stacks, queues, trees, and graphs.

Conditional statements are used to execute certain code based on a specific condition being met.

• Conditional statements are often written using if/else statements

• The condition is placed inside the parentheses after the if keyword

• If the condition is true, the code inside the if block is executed, otherwise the code inside the else block is executed

• Example: if(x > 5) {do something} else {do something else}

Program to print prime numbers

• Start with a loop from 2 to n (number to check)

• For each number, check if it is divisible by any number from 2 to its square root

• If not divisible, it is a prime number and print it

Code in the code.org platform

• Use block-based coding to create programs

• Drag and drop blocks to sequence commands

• Test and debug your code to ensure it runs correctly

Constructor is used to initialize an object when it is created, while destructor is used to clean up resources when an object is destroyed.

• Constructor is called when an object is created, while destructor is called when an object is destroyed.

• Constructors can have parameters to initialize the object, while destructors do not take any parameters.

• Example: Constructor initializes member variables of a class, while destructor releases any resources acquired by the object.