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Explain the difference between library functions and user-defined functions in C programming language.
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?
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.
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.
Provide an example of a user-defined function in C and its potential application.
What is the role of a subprogram in the context of functions in C programming?
What is the role of a subprogram in the context of functions in C programming?
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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,
lengthandwidth, 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.
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