0x10-variadic_functions

C - Variadic functions

In this project, I learned about using variadic functions with the va_start, va_arg, and va_end macros as well as why and how to use the const type qualifier in C.

Header File 📁

• variadic_functions.h: Header file containing definitions and prototypes for all types and functions written in the project.

File	Definition/Prototype
0-sum_them_all.c	int sum_them_all(const unsigned int n, ...);
1-print_numbers.c	void print_numbers(const char *separator, const unsigned int n, ...);
2-print_strings.c	void print_strings(const char *separator, const unsigned int n, ...);
3-print_all.c	void print_all(const char * const format, ...);

Tasks 📃

• 0. Beauty is variable, ugliness is constant

  • 0-sum_them_all.c: C function that returns the sum of all its paramters.
    • If the parameter n == 0, the function returns 0.

• 1. To be is to be the value of a variable

  • 1-print_numbers.c: C function that prints numbers, followed by a new line.
    • The paramter separator is the string to be printed between numbers.
    • The paramter n is the number of integers passed to the function.
    • If separator is NULL, it is not printed.

• 2. One woman's constant is another woman's variable

  • 2-print_strings.c: C function that prints strings, followed by a new line.
    • The parameter separator is the string to be printed between the strings.
    • The parameter n is the number of strings passed to the function.
    • If separator is NULL, it is not printed.
    • If one of the strings is NULL, the function prints (nil) instead.

• 3. To be is a to be the value of a variable

  • 3-print_all.c: C function that prints anything.
    • Usage: print_all("ceis", 'H', 0, "lberton");
    • The paramter format is a list of types of arguments passed to the function (c:char, i:int, f:float, s:char * (if the string is NULL, (nil) is printed instead))
    • Any other character is ignored.
    • A new line is printed at the end of the function.