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Question-1. How do you declare a generic function in Chapel?
Answer-1: Use type variables, e.g., proc add[T](a: T, b: T): T { return a + b; }.
Question-2. What is a config variable in Chapel?
Answer-2: A config variable allows values to be set at runtime via command-line arguments.
Question-3. How do you define a config variable in Chapel?
Answer-3: Use config, e.g., config const n = 10;.
Question-4. What is a module in Chapel?
Answer-4: A module is a collection of related functions, types, and variables.
Question-5. How do you import a module in Chapel?
Answer-5: Use the use keyword, e.g., use Math;.
Question-6. What is the inline keyword in Chapel?
Answer-6: inline suggests that a function should be inlined to improve performance.
Question-7. How do you handle exceptions in Chapel?
Answer-7: Use try, catch, and throw statements, e.g., try { ... } catch { ... }.
Question-8. What is the role of throw in Chapel?
Answer-8: throw is used to raise an exception.
Question-9. How do you define a range in Chapel?
Answer-9: Use the range operator .., e.g., 1..10.
Question-10. How do you define a constant in Chapel?
Answer-10: Use the const keyword, e.g., const PI = 3.14;.
Question-11. What is proc init in Chapel?
Answer-11: proc init is the constructor for initializing records or classes.
Question-12. What is a where clause in Chapel?
Answer-12: A where clause is used to add constraints to functions, e.g., where T == int.
Question-13. How does Chapel implement parallelism?
Answer-13: Chapel uses tasks, loops (forall, coforall), and synchronization primitives.
Question-14. What is the difference between cobegin and begin?
Answer-14: cobegin runs multiple tasks in parallel, while begin creates a single task.
Question-15. What is the purpose of sync in Chapel?
Answer-15: sync blocks until all nested tasks have completed.
Question-16. How do you create an array in Chapel?
Answer-16: Use the square brackets, e.g., var arr: [1..10] int;.
Question-17. What is a distributed array in Chapel?
Answer-17: A distributed array is spread across multiple locales for parallel processing.
Question-18. What is the difference between ref and const ref?
Answer-18: ref allows modification, while const ref ensures the reference cannot be modified.
Question-19. How do you measure execution time in Chapel?
Answer-19: Use the time module, e.g., use Time; writeln(getCurrentTime());.
Question-20. What are some Chapel compiler flags?
Answer-20: Flags include --fast for optimization and --locale-model for specifying the locale model.
Question-21. What is Chapel?
Answer-21: Chapel is a parallel programming language designed for high-performance computing (HPC).
Question-22. Who developed Chapel?
Answer-22: Chapel was developed by Cray Inc. as part of the DARPA High Productivity Computing Systems program.
Question-23. What does Chapel stand for?
Answer-23: Chapel stands for "Cascade High-Productivity Language."
Question-24. What are the key features of Chapel?
Answer-24: Key features include parallelism, locality control, task coordination, and simplicity.
Question-25. What type of language is Chapel?
Answer-25: Chapel is a parallel, multithreaded, and high-level programming language.
Question-26. How do you define a variable in Chapel?
Answer-26: Use var followed by the variable name, e.g., var x: int = 10;.
Question-27. What is a task in Chapel?
Answer-27: A task is a unit of work that can execute independently in parallel.
Question-28. How do you declare a function in Chapel?
Answer-28: Use the proc keyword, e.g., proc add(a: int, b: int): int { return a + b; }.
Question-29. What is the begin keyword in Chapel?
Answer-29: begin is used to create a new task that runs concurrently with the main program.
Question-30. How do you create a loop in Chapel?
Answer-30: Use the for keyword, e.g., for i in 1..10 { writeln(i); }.
Question-31. What is a coforall loop in Chapel?
Answer-31: A coforall loop is used to spawn parallel iterations of a loop.
Question-32. What is a forall loop in Chapel?
Answer-32: A forall loop is used to distribute loop iterations across multiple tasks in parallel.
Question-33. How do you manage data locality in Chapel?
Answer-33: Data locality is managed using domains, distributions, and locales.
Question-34. What is a domain in Chapel?
Answer-34: A domain defines a set of indices for array dimensions.
Question-35. How do you declare a domain in Chapel?
Answer-35: Use the domain keyword, e.g., var D: domain(1) = {1..10};.
Question-36. What is a locale in Chapel?
Answer-36: A locale is a unit of the target architecture where tasks and data can reside.
Question-37. How do you query the number of locales in Chapel?
Answer-37: Use the built-in constant numLocales.
Question-38. How do you map data to locales in Chapel?
Answer-38: Use distributed domains and arrays.
Question-39. What is the sync variable in Chapel?
Answer-39: A sync variable ensures synchronization between tasks.
Question-40. What is the atomic variable in Chapel?
Answer-40: An atomic variable supports atomic operations, ensuring safe concurrent access.
Question-41. How do you create a parallel block in Chapel?
Answer-41: Use the cobegin statement, e.g., cobegin { task1(); task2(); }.
Question-42. What is a reduce operation in Chapel?
Answer-42: A reduce operation aggregates values, e.g., summing elements in a parallel array.
Question-43. What is a scan operation in Chapel?
Answer-43: A scan operation computes partial reductions, producing an array of intermediate results.
Question-44. What is a tuple in Chapel?
Answer-44: A tuple is a fixed-size collection of values, e.g., (1, "a", true).
Question-45. How do you define a tuple in Chapel?
Answer-45: Use parentheses, e.g., var t = (1, "a", true);.
Question-46. What are records in Chapel?
Answer-46: Records are user-defined types similar to structs in C.
Question-47. How do you define a record in Chapel?
Answer-47: Use the record keyword, e.g., record Point { var x: int; var y: int; }.
Question-48. What is a class in Chapel?
Answer-48: A class is a reference type used for creating objects.
Question-49. How do you define a class in Chapel?
Answer-49: Use the class keyword, e.g., class Rectangle { var width: int; var height: int; }.
Question-50. How do you allocate a class in Chapel?
Answer-50: Use the new keyword, e.g., var rect = new Rectangle();.
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