136. OCR A Level (H046-H446) SLR23 – 2.2 Functions & procedures

What is modularity in programming?

• The practice of writing code in a single, large block

• The concept of breaking a large program into smaller chunks

• The process of writing code without errors

• A method of passing parameters by value

Answer explanation

Modularity in programming refers to the concept of breaking a large program into smaller, manageable chunks, making the code more organized and easier to maintain.

What is the difference between a function and a procedure?

• A procedure returns a value, while a function does not

• A function returns a value, while a procedure does not

• A function can only take one parameter, while a procedure can take multiple

• There is no difference between a function and a procedure

Answer explanation

A function returns a value, while a procedure does not

What does parameter passing by value mean?

• A copy of the variable is passed to the subroutine

• A pointer to the original variable is passed

• The value is passed by reference

• The original variable is directly modified

Answer explanation

Parameter passing by value means a copy of the variable is passed to the subroutine, not the original variable itself.

What does parameter passing by reference mean?

• A pointer to the original variable is passed

• The original variable cannot be modified

• The value is passed by value

• A copy of the variable is passed to the subroutine

Answer explanation

Parameter passing by reference means a pointer to the original variable is passed, allowing modifications to the original variable within the subroutine.

Why is it a good idea to develop code in a modular way?

• It requires more memory

• It prevents the code from being executed

• It allows for code to be reused in different parts of a program

• It makes the code harder to understand

Answer explanation

Developing code in a modular way allows for code to be reused in different parts of a program, increasing efficiency and reducing redundancy.

What is the result of passing a parameter by reference and modifying it?

• The original variable is unaffected

• The copy of the variable is modified

• The original variable is modified

• A new variable is created

Answer explanation

The original variable is modified

What is a common way to output text to a console in C#?

• print()

• System.out.println()

• echo()

• Console.WriteLine()

Answer explanation

The correct way to output text to a console in C# is by using Console.WriteLine().

What is the significance of the 'byval' and 'byref' keywords?

• They have no specific use

• They are used to declare functions

• They indicate whether a parameter is passed by value or by reference

• They are used to define variables

Answer explanation

The 'byval' and 'byref' keywords indicate whether a parameter is passed by value or by reference, respectively.

In the context of the video, what should you have a solid understanding of before watching?

• Basic programming concepts and different data types

• Advanced mathematical theories

• Computer hardware specifications

• History of programming languages

Answer explanation

The correct answer is basic programming concepts and different data types because the video assumes viewers have this foundational knowledge.

What is the goal when designing a program in a modular way?

• To design each module to carry out a single specific task

• To increase the complexity of the code

• To use as many functions and procedures as possible

• To make the program run faster

Answer explanation

The goal when designing a program in a modular way is to design each module to carry out a single specific task, increasing code organization and reusability.