What is wrong with this factorial code in c language?

Question

I was trying coding factorial problem in c using functions. I don't get this
https://code.sololearn.com/cZRCs2gI7lxY/?ref=app

Answer 1

You didn't declare fact
declare some value to fact before multiplying it. here for factorial use fact=1;

int i=1;
int fact=1;
while (i<=num)
{
fact=fact*i;
i++;
}
return fact;

Answer 2

Thankyou
I made a silly mistake hehe