0x10-variadic_functions

Variadic functions in C

Variadic functions are a versatile feature in the C programming language that allows you to define functions with a variable number of arguments. These functions are essential for creating flexible and generic functions that can operate on different numbers of parameters.

A variadic function is defined using the ellipsis (...) in its parameter list, indicating that it can accept a variable number of arguments. The stdarg.h library provides a set of macros and functions that enable you to work with these variable arguments within the function.

Common use cases for variadic functions include:

• Printf-like Functions: Variadic functions are used extensively in C's standard library, especially in functions like printf and scanf, which can accept varying numbers of arguments based on format specifiers.

• Custom Utility Functions: You can create your own variadic functions to handle specialized cases, such as logging functions that accept a variable number of arguments for message formatting.

• Dynamic Data Processing: Variadic functions are valuable when dealing with data of unknown or variable structure, allowing you to process or manipulate it efficiently.

Learning Objectives

• What are variadic functions
• How to use va_start, va_arg and va_end macros
• Why and how to use the const type qualifier

File	Description
0-sum_them_all.c	Returns the sum of all its parameters.
1-print_numbers.c	Prints numbers.
2-print_strings.c	Prints strings.
3-print_all.c	Prints anything.
variadic_functions.h	The header file.