Variadic Functions

Functions taking a variable number of arguments, like `printf`, using `stdarg.h`.

Intermediate

#include <stdarg.h>
int sum(int n, ...) {
    va_list ap; va_start(ap, n);
    int s = 0; while (n--) s += va_arg(ap, int);
    va_end(ap); return s;
}

No type checking — prefer fixed parameters when possible.

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