#include<pthread.h>
#include<stdio.h>

void* fib_calc(void* arg){
	unsigned long int n = (unsigned long int)arg;
	if(n > 2)
		return (void*)((unsigned long int)fib_calc((void*)(n-1)) + (unsigned long int)fib_calc((void*)(n-2)));
	return (void*)1;
}

int main(){
	pthread_t our_thread;
	pthread_create(&our_thread, 0,  fib_calc, (void*)45); 

	printf("Expecting value:  %ld\n", fib_calc((void*)45));
	void* retval;
	pthread_join(our_thread, &retval);
	printf("Return value was:  %ld\n", retval);

	return 0;
}