Can you explain variadic functions in C?

Can you explain variadic functions in C?

Sure! Variadic functions in C are functions that can accept a variable number of arguments. They are defined using an ellipsis (...) in the function's parameter list.

How do I define a variadic function?

To define a variadic function, you use the ellipsis in the parameter list. For example: int sum(int count, ...).

How do I access the arguments inside the function?

You can use the stdarg.h library, which provides macros like va_start, va_arg, and va_end to handle the arguments.

Can you give me an example of using a variadic function?

Certainly! Here's a simple example that sums integers:

#include <stdio.h>
#include <stdarg.h>

int sum(int count, ...) {
    va_list args;
    int total = 0;
    va_start(args, count);
    for (int i = 0; i < count; i++) {
        total += va_arg(args, int);
    }
    va_end(args);
    return total;
}