Pascal Programming Interview Questions and Answers

Pascal is a high level procedural level programming language that uses structured programming and data structures to encourage good programming. Pascal programming language was originally developed in 1970 by Niklaus Wirth. He is French mathematician, philosopher and physicist Blaise Pascal. Pascal is a relatively easy language, and helps novice programmers to introduce them to other languages such as C, C++, Java or C# – it is the doorstep to other high level programming languages.

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Top 10 Pascal programming Interview Questions & Sample answers

Question 1: What are the key features of Pascal?
Sample Answer: Strong typing, structured programming constructs, and modular programming are some key features of Pascal. It also emphasizes on readability and ease of maintenance.

Question 2: How is memory managed in Pascal?
Sample Answer: Pascal uses manual memory management. Developers are responsible for allocating and deallocating memory using new and dispose or getmem and freemem procedures.

Question 3: Explain the difference between := and = in Pascal.
Sample Answer: In Pascal, := is the assignment operator, while = is the equality operator. := is used to assign a value to a variable, and = is used to compare two values for equality.

Question 4: What is the purpose of the var keyword in Pascal?
Sample Answer: The var keyword is used to declare variables in Pascal. It indicates that the variable’s value can be changed during the execution of the program.

Question 5: Describe the significance of the begin and end keywords in Pascal.
Sample Answer: The begin and end keywords are used to delimit a block of code in Pascal. They define the scope of procedures, functions, loops, and conditional statements.

Question 6: How are arrays implemented in Pascal?
Sample Answer: Arrays in Pascal are implemented with a fixed size and start indexing from 1. The declaration syntax is var myArray: array[1..N] of DataType;, where N is the size of the array.

Question 7: What is the purpose of the record type in Pascal?
Sample Answer: The record type in Pascal is used to define a user-defined data structure that can hold different data types under a single name. It is similar to a struct in other languages.

Question 8: Explain the concept of pointers in Pascal.
Sample Answer: Pascal supports pointers through the ^ (caret) symbol. Pointers are used for dynamic memory allocation and manipulation. They are declared with the ^ symbol followed by the type.

Question 9: How is exception handling done in Pascal?
Sample Answer: Pascal uses the try, except, and finally blocks for exception handling. Code that might raise an exception is placed inside the try block, and corresponding exception handling code is written in the except block.

Question 10: Discuss the difference between procedural and object-oriented programming in Pascal?
Sample Answer: Procedural programming in Pascal involves writing procedures and functions that manipulate data, while object-oriented programming (OOP) introduces concepts like classes and objects, enabling encapsulation, inheritance, and polymorphism.

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