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Question-1. What is X++?
Answer-1: X++ is an object-oriented, proprietary programming language used for Microsoft Dynamics 365 Finance and Operations (formerly AX).
Question-2. What is the primary use of X++?
Answer-2: It is mainly used for business logic customization in Microsoft ERP systems.
Question-3. What type of language is X++?
Answer-3: X++ is an imperative, object-oriented, and event-driven language.
Question-4. What platforms support X++?
Answer-4: X++ runs on Microsoft Dynamics 365 Finance and Operations and earlier versions like AX 2012.
Question-5. How do you declare a variable in X++?
Answer-5: int num = 10; declares an integer variable num with value 10.
Question-6. What is a table buffer in X++?
Answer-6: A table buffer is an instance of a table, used to query and manipulate data.
Question-7. How do you retrieve records from a table in X++?
Answer-7: select * from CustTable; fetches all records from CustTable.
Question-8. What is the difference between select and while select in X++?
Answer-8: select retrieves one record, whereas while select iterates over multiple records.
Question-9. How do you insert a record in X++?
Answer-9: CustTable cust; cust.AccountNum = "123"; cust.insert(); inserts a new customer.
Question-10. What is an EDT in X++?
Answer-10: Extended Data Type (EDT) is a reusable data type that enhances consistency.
Question-11. What is a Base Enum in X++?
Answer-11: A Base Enum is a fixed set of named values used for categorization.
Question-12. What is a macro in X++?
Answer-12: A macro is a reusable code snippet, defined using #define in X++.
Question-13. What is an AX class in X++?
Answer-13: A class is a blueprint for objects that encapsulates business logic.
Question-14. How do you create a class in X++?
Answer-14: class MyClass {} defines a new class named MyClass.
Question-15. What are methods in X++?
Answer-15: Methods are functions defined within a class to perform operations.
Question-16. What is void in X++?
Answer-16: void represents a method that does not return a value.
Question-17. How do you create an object in X++?
Answer-17: MyClass obj = new MyClass(); creates an instance of MyClass.
Question-18. What are table methods in X++?
Answer-18: Table methods contain business logic related to a specific table.
Question-19. How do you update records in X++?
Answer-19: t.update(); updates an existing record in a table buffer t.
Question-20. What is ttsBegin and ttsCommit in X++?
Answer-20: They define a transaction block, ensuring atomic database operations.
Question-21. What is delete_from in X++?
Answer-21: delete_from is used to delete multiple records from a table.
Question-22. How do you call a static method in X++?
Answer-22: MyClass::methodName(); calls a static method.
Question-23. What are RunBase classes in X++?
Answer-23: RunBase is a base class used for batch processing and dialog boxes.
Question-24. What is an Args object in X++?
Answer-24: The Args class is used to pass parameters between forms and reports.
Question-25. What are Query objects in X++?
Answer-25: Query objects allow dynamic data retrieval without writing SQL.
Question-26. What is SysOperation Framework in X++?
Answer-26: A framework for batch processing and asynchronous execution.
Question-27. How do you handle exceptions in X++?
Answer-27: Using try...catch blocks for error handling.
Question-28. What is the strFmt function in X++?
Answer-28: It formats strings, similar to printf in C.
Question-29. What does element.args().caller() do?
Answer-29: It retrieves the calling object in a form.
Question-30. What is next keyword in X++?
Answer-30: It calls the base class implementation of an overridden method.
Question-31. What is a Data Dictionary in X++?
Answer-31: The Data Dictionary defines tables, fields, relationships, and indexes.
Question-32. What is display method in X++?
Answer-32: A display method is used in forms and reports to show calculated fields.
Question-33. How do you call a form in X++?
Answer-33: new MenuFunction("FormName", MenuItemType::Display).run();
Question-34. What is an event handler in X++?
Answer-34: A function that listens to and responds to system events.
Question-35. What is setTmp in X++?
Answer-35: It sets a temporary table as the data source for a form.
Question-36. What is a temporary table in X++?
Answer-36: A table that stores data only for the duration of the session.
Question-37. What is eventDriven in X++?
Answer-37: It refers to trigger-based programming, where actions occur on events.
Question-38. What is find method in X++?
Answer-38: It is a custom method in tables to retrieve records based on criteria.
Question-39. What is an init method in X++?
Answer-39: It initializes form fields or report values.
Question-40. What is a pack and unpack method in X++?
Answer-40: They serialize and deserialize object states for batch processing.
Question-41. What is Map in X++?
Answer-41: A Map is a key-value data structure used for storing data dynamically.
Question-42. What is Set in X++?
Answer-42: A Set is a collection of unique values.
Question-43. How do you sort records in X++?
Answer-43: Using order by in a select statement.
Question-44. How do you create an array in X++?
Answer-44: int myArray[3] = [1,2,3];
Question-45. What is an index in X++?
Answer-45: An index improves table search performance.
Question-46. What is recId in X++?
Answer-46: recId is a system-generated unique identifier for each record.
Question-47. What is a menu item in X++?
Answer-47: A user interface component that launches forms, reports, or classes.
Question-48. What is a workflow in X++?
Answer-48: It automates approval processes in Dynamics 365.
Question-49. What is extend in X++?
Answer-49: It is used to create new objects from existing ones.
Question-50. How do you check if a record exists in X++?
Answer-50: Using if (CustTable::find("123")) { } to check for a customer.
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