Pascal Interview Questions

Last update: 12 Jan 2020, 22 QuestionsAsk Question
A Quick Overview of Pascal
Pascal Interview Questions

Best Pascal Interview Questions And Answers

  • It is a structured language that has structures like repeat-until statements, if-else.
  • It provides simplicity and a modern approach
  • It includes data structures like arrays, pointers, records, and files
  • It provides exact sizes used by operators

It is a collection of elements of the same type which allows defining the set data type.

A program consists of modules known as Pascal units which consist of code blocks, variables, statement procedures, and declarations.

Data types mean a range of value that a variable can store. The predefined data types are integers, the real numbers, Boolean data types files that define only two values, and the last one is a char data type.

To display the flow of control in a structured manner, Pascal uses a structured programming language. It also uses the goto statement that gives control to the main program in a recursive manner.

The sub-range means implementation of the functions for data conversions on the data types like real to the integer. One such is

  • X: 1.. 10;
  • Y: ‘a’..’z’;
  • Z: Apple. Mango;

The different pointer types used in Pascal are recorder pointer, reference pointer, and the last associate pointer.

The first method is an application which allows using implementation and features according to the compiler and second is a compiler that is likely to implement the features that are compatible with one another.

Constant means which remains unchanged.

Following are the 6 constants

  • Set Types
  • Real Types
  • Ordinal Types
  • Pointer Types
  • String and char

The syntax used to declare constant is
Identifier = constant_value;

Character Arrays, string variables, short strings, null terminated strings, and last ANSI strings.

The base type determines the type of components like subrange, record, arrays, Boolean, Integer, and much more. Technically it means
File-name = file of base-type;

Pascal uses extensions to extend the features uses in language but a program that is coded with the language doesn’t use many extensions because of fewer requirements of high performances.

  • First, go to compile menu in Turbo Pascal
  • Then select compile to memory
  • Now open the menu again
  • It will say Compile to disk
  • Select compile and it will automatically create a .exe file
S.no Modern Pascal Standard Pascal
1. Modern Pascal provides backward compatibility with their parameters Standard Pascal doesn’t provide this kind of approach.
2. Modern Pascal uses less ambiguity and more securities while coding or programming. Standard Pascal uses less security and more ambiguity while programming or coding.
3. Modern Pascal provides a definitive type of compatibility with its symbols or parameters. Standard Pascal doesn’t provide anything related to parameters or symbols.
4. Modern Pascal removes the length of the symbol. Standard Pascal doesn’t remove the symbol length limit.
5. Modern Pascal provides Var parameters and makes advancement over standard. Standard Pascal does not provide these types of parameters.

P-machine Pascal is the variant of the Pascal and following are the changes that made in P-machine.

  • Dispose was not being implemented in the P-machine
  • It was replaced by mark and release keywords
  • Goto has no reference targets
  • P-machine allows the use of pre-defined Identifiers
  • Like round, page, disclose and maxing

Custom string run fast has more space, takes the input from the user, and it is easier for the program to makes an entry in the table. The string size can be changed and the string libraries help in easier to code with.

Constructors: This method is also known as Init which can be created by declaring a method with the keyword.

Destructors: This method is called during the destruction of the object can destroy any memory created by constructors.

There are three loops in Pascal:

  • Pretest: It tests a Boolean expression and then goes into a loop if true.
  • Posttest: It executes the loop and then tests the Boolean expression.
  • Fixed Repetition: It repeats a fixed number of items.
  • The Semicolons used as statement separators because other statements can be executed.
  • For a case or block statement, there is no need for semi-colon as it needs to get executed.
  • There is no use of semicolon before the keyword end as it reflects the record type declaration.
  • The semicolon is applied where there is a sequence of statement that is written in more statement.

Firstly Pascal can’t handle the string of characters and it is one of the top disadvantages of the language.

  • It is easier to handle large programs because by using Units it splits into a smaller section
  • By adding UNITS, one can use the same code in some other program to do the same job.
  • If you put a code in a unit, it becomes easy to call and use it again.
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