Use Named And Optional Parameters In C | How To

For a more "classic" C approach, you can use variadic functions, though these do not provide true named parameters and are harder to use safely.

Struct members not explicitly initialized are automatically set to zero or NULL by the compiler, effectively making them "optional". Example Implementation: How to use named and optional parameters in C

#include // Define a struct to hold "parameters" typedef struct { int width; int height; const char *title; // Optional (defaults to NULL) } WindowArgs; void create_window(WindowArgs args) { printf("Window: %s (%dx%d)\n", args.title ? args.title : "Untitled", args.width, args.height); } int main() { // Named and optional call using a compound literal create_window((WindowArgs){.width = 800, .height = 600}); // Changing order and including all fields create_window((WindowArgs){.title = "Game", .height = 1080, .width = 1920}); return 0; } Use code with caution. Copied to clipboard 2. Enhancing with Macros for Cleaner Syntax For a more "classic" C approach, you can