Types of functions in C language

Functions can be categorized into various types based on their characteristics and roles within a program. 

Here's an in-depth explanation of different types of functions in the C programming language:

1). Standard Library Functions

2). User-Defined Functions

3). Recursive Functions

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Standard Library Functions:

Standard library functions are predefined functions provided by the C standard library. They serve common tasks and are declared in standard header files. Examples include printf(), scanf(), malloc(), and strlen().

#include <stdio.h> int main() { printf("Hello, World!\n"); return 0; }

User-Defined Functions:

These are functions created by the programmer to perform specific tasks within the program. User-defined functions improve code modularity and readability.

void greet() { printf("Hello, from the user-defined function!\n"); } int main() { greet(); // Calling the user-defined function return 0; }

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Recursive Functions:

Recursive functions are functions that call themselves, either directly or indirectly. They are often used to solve problems that can be naturally broken down into smaller instances of the same problem.

int factorial(int n) { if (n == 0 || n == 1) { return 1; } else { return n * factorial(n - 1); } }