Factorial of a number in pl/sql (Not showing the correct output)

I have written down a code in pl/sql but output is not showing
having trouble with this code.

declare

num number(20):= 0;
val number(10):= 5;
temp number(10):= 0;

function factorial (n1 in number)
return number
is
fact number(10):= 1;

begin
temp:= n1;
loop
  if fact <=0 then
     exit;
  else
     fact := fact *temp;
     temp:=temp-1;
  end if;
end loop;
return fact;
end;

begin
num:= factorial(val);
dbms_output.put_line('Factorial of ' ||val||' is '||num);
end;

Output:- Factorial of 5 is 0

>Solution :

The line:

if fact <=0 then

should be:

if temp <=0 then

You don’t really need the ‘else’ part, because the ‘if’ exits the loop anyway; so you could do:

loop
  if temp <=0 then
     exit;
  end if;
  fact := fact *temp;
  temp:=temp-1;
end loop;

Or avoid the explicit check by using a while loop:

while temp > 0 loop
  fact := fact *temp;
  temp:=temp-1;
end loop;

… etc.

db<>fiddle