Cognizant Program Analyst Interview Questions and Answers

One new technology I know about is blockchain, a decentralized and secure way to store and transfer data.

• Blockchain is a distributed ledger technology that securely records transactions across multiple computers.

• It is most commonly known for being the technology behind cryptocurrencies like Bitcoin.

• Blockchain has applications beyond finance, such as supply chain management, voting systems, and healthcare records.

• S...read more

A simple Python program can perform basic tasks like calculations, data manipulation, or file handling.

• Use 'print()' to display output. Example: print('Hello, World!')

• Define functions with 'def'. Example: def add(a, b): return a + b

• Utilize lists for data storage. Example: my_list = [1, 2, 3]

• Implement loops for iteration. Example: for i in range(5): print(i)

• Use conditionals for decision-making. Example: if a > b...read more

For loop is used for iterating over a sequence while while loop is used for executing a block of code repeatedly.

• For loop is used when the number of iterations is known beforehand

• While loop is used when the number of iterations is not known beforehand

• For loop is faster than while loop for iterating over a sequence

• While loop is useful for creating an infinite loop until a certain condition is met

An abstract class is a class that cannot be instantiated and is used as a base class for other classes.

• An abstract class can have abstract and non-abstract methods.

• Abstract methods have no implementation and must be implemented by the derived classes.

• An abstract class can have constructors and fields.

• An example of an abstract class is the Shape class, where the methods like area() and perimeter() are abstract and ...read more

Code for critical section in C/Java/C++

• Use mutex or semaphore to protect critical section

• In C/C++, use pthread_mutex_lock() and pthread_mutex_unlock()

• In Java, use synchronized keyword

• In C++, use std::mutex and std::lock_guard

• Ensure only one thread can access critical section at a time

Run time mapping between pages and frames is the process of mapping virtual memory pages to physical memory frames during program execution.

• During program execution, the operating system maps virtual memory pages to physical memory frames to ensure efficient memory management.

• This mapping is done dynamically and can change as the program runs.

• The mapping is maintained in a page table, which is used by the operatin...read more