Using two threads to compute Fibonacci and factorial

#include<stdio.h>
#include<pthread.h>
#include<tgmath.h>
void *factorial(void *p);
void *fibb(void *p);
int fact(int n);
int main(){
pthread_t tid1;
pthread_t tid2;
pthread_attr_t attr; // set of thread attributes
 
//get the default attributes
pthread_attr_init(&attr);
pthread_create(&tid1,&attr,factorial,NULL);
pthread_join(tid1,NULL); 
pthread_create(&tid2,&attr,fibb,NULL);
pthread_join(tid2,NULL); 

}
int fact(int n){
if(n==0 || n==1)
return 1;
else 
return n*fact(n-1);
}
void *factorial(void *p){
int i,num1;
printf("Thread 1 (factorial) : ");
printf("Enter Number: ");
scanf("%d",&num1);
printf("Factorial is: %d\n",fact(num1));
pthread_exit(0);
 
}

void *fibb(void *p){
int i,num1,fib[1000];
printf("Thread 2 (fibonacci) : ");
printf("Enter the Nth index of series: ");
scanf("%d",&num1);
fib[0]=0;
fib[1]=1;
for(i=2;i<num1;i++)
fib[i]=fib[i-1]+fib[i-2];
printf("The %dth term of series is : %d",num1,fib[num1-1]);
pthread_exit(0);

}

Output sample: