C Functions Classification Quiz

5 Questions

Explain the difference between library functions and user-defined functions in C programming language.

Library functions are built-in functions available in the standard library of C, while user-defined functions are functions written by the programmer to perform specific tasks. Library functions do not need to be written by the programmer, whereas user-defined functions have to be developed by the user at the time of writing a program.

What is the purpose of using user-defined functions in C programming?

The purpose of using user-defined functions in C programming is to facilitate top-down modular programming, allowing for better organization and reusability of code.

Give an example of a library function in C and explain its purpose.

An example of a library function in C is 'printf()' or 'scanf()', which performs input/output functions. These functions are available in the standard C library and are used for displaying output and taking input from the user.

Provide an example of a user-defined function in C and its potential application.

An example of a user-defined function in C is 'addition()', which could be written to perform addition of two numbers. This function can be used to add numbers in a program without having to rewrite the addition logic each time.

What is the role of a subprogram in the context of functions in C programming?

A subprogram in the context of functions in C programming receives values called arguments from a calling program, performs calculations, and returns the results to the calling program. It acts as a separate, independent program that can be invoked by the main program or other subprograms.

Study Notes

Functions in C Programming

Library Functions vs. User-Defined Functions

Library functions are pre-written functions provided by the C standard library, which can be used directly in a program.
User-defined functions, on the other hand, are created by the programmer to perform specific tasks.

Purpose of User-Defined Functions

User-defined functions allow programmers to break down complex programs into smaller, manageable modules.
They provide code reuse, making it easier to modify and maintain programs.
They also help to reduce code redundancy and improve readability.

Library Function Example

printf() is a library function in C that outputs formatted data to the standard output.
It takes a string and optional arguments, and prints the formatted string to the screen.

User-Defined Function Example

A user-defined function calculateArea() can be created to calculate the area of a rectangle.
It takes two parameters, length and width, and returns the calculated area.
This function can be used in various programs that require area calculations.

Role of Subprograms

A subprogram is a function that performs a specific task within a larger program.
In C programming, subprograms are functions that are called by the main program to perform specific tasks.
Subprograms help to organize code, reduce complexity, and improve program maintainability.