sum_rec.c

#include <stdio.h>
#include <stdlib.h>

int main (int argc, char *argv[]) {
	unsigned long base_address = (unsigned long)argv;
	unsigned long address = (unsigned int)argc | (base_address & 0xFFFFFFFF00000000);
	if (address == base_address) return 0;
	else if (address > base_address) {
		return atoi(*(char**)address) + main((unsigned long)((char**)address - 1), argv);
	} else {
		printf("%d\n", main((unsigned long)(argv + argc - 1), argv));
		return 0;
	}
}