29 Lecture

Q: In C++, which feature can be used for automatic resource management in file handling? a) try-catch block b) smart pointers c) dynamic memory allocation d) static variables Solution: b) smart pointers Q: In Java, which statement is used for automatic resource management in file handling? a) try-catch block b) finalize() method c) using statement d) try-with-resources Solution: d) try-with-resources Q: What should you do before opening a file in C++ or Java? a) Close any other open files. b) Check for file existence. c) Check the file size. d) Create a backup of the file. Solution: b) Check for file existence. Q: Which file stream class in C++ provides buffered file input? a) std::ifstream b) std::ofstream c) std::fstream d) std::stringstream Solution: a) std::ifstream Q: In Java, which java.io class is commonly used for buffered file input? a) BufferedReader b) FileWriter c) FileReader d) BufferedWriter Solution: a) BufferedReader Q: What is the purpose of using relative paths in file handling? a) To improve performance. b) To ensure file security. c) To handle large files efficiently. d) To avoid hardcoding absolute paths and improve portability. Solution: d) To avoid hardcoding absolute paths and improve portability. Q: Which method is used for reading files line-by-line in Java? a) readLine() b) read() c) readAllLines() d) readChar() Solution: a) readLine() Q: How should files be closed after usage in both C++ and Java? a) It is not necessary to close files manually. b) Use close() method in Java and delete keyword in C++. c) Use fclose() function in C++ and close() method in Java. d) Explicitly call close() method in Java and let C++ handle it automatically. Solution: c) Use fclose() function in C++ and close() method in Java. Q: Which mode should be used for opening binary files in C++? a) ios::out b) ios::binary c) ios::in d) ios::app Solution: b) ios::binary Q: How should exceptions be handled during file handling? a) Never use exceptions for file handling. b) Use try-catch blocks to handle exceptions gracefully. c) Use throws clause in Java and noexcept specifier in C++. d) Ignore exceptions to avoid program termination. Solution: b) Use try-catch blocks to handle exceptions gracefully.

Q: How do you open a file for reading in C++? A: You can open a file for reading in C++ using the std::ifstream class and the open() method with the file path as the argument. Q: What is the purpose of using buffered file streams in Java? A: Buffered file streams, such as BufferedReader and BufferedWriter, improve file I/O performance by reducing frequent disk access. Q: How can you handle exceptions during file handling in Java? A: In Java, you can use try-catch blocks to catch and handle exceptions that may occur during file operations, ensuring graceful error handling. Q: What precautions should be taken when using relative file paths? A: When using relative file paths, ensure that the current working directory is consistent across different environments to access files correctly. Q: How do you close a file after reading or writing in C++? A: In C++, you can close a file opened for reading or writing using the close() method or automatically by the file stream's destructor. Q: What is the benefit of using the try-with-resources statement in Java for file handling? A: The try-with-resources statement automatically closes resources (e.g., file streams) after execution, reducing manual cleanup code. Q: Why should you check for file existence before opening it? A: Checking file existence prevents potential exceptions and ensures that you are working with valid files, avoiding unexpected behavior. Q: How does the DRY (Don't Repeat Yourself) principle relate to file handling? A: The DRY principle encourages code reuse, leading to the creation of functions or classes that handle file operations, minimizing code duplication. Q: How can you read a file line-by-line in C++? A: In C++, you can use a std::ifstream object to read a file line-by-line using a loop and the getline() function. Q: What are some common file handling pitfalls in both C++ and Java? A: Common pitfalls include not closing files after usage, improper error handling, incorrect file paths, and insufficient memory management.