What are variadic functions (va_list) in C?
main.c
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
int sum(int count, ...) {
va_list args;
va_start(args, count);
int s = 0;
int i;
for (i = 0; i < count; i++) {
int x = va_arg(args, int);
s += x;
}
va_end(args);
return s;
}
int sum2(int a, ...) {
va_list args;
va_start(args, a);
int s = a;
int i;
int x = va_arg(args, int);
while(x != 0) {
s += x;
x = va_arg(args, int);
}
va_end(args);
return s;
}
int main(int argc, char *argv[]) {
printf("Sum is: %d\n", sum2(1, 2, 3, 4, 0));
return 0;
}