Factorial of a number in PL/SQL

Prerequisite – PL/SQL introduction
In PL/SQL code groups of commands are arranged within a block. A block group related declarations or statements.
In declare part, we declare variables and between begin and end part, we perform the operations.

Here, first, we take three variables num, fact, and temp and assign the value in num variable (i.e which number factorial we want).
And then after we assign fact variable to 1.

Examples:

Input : 4
Output : 24

Input : 6
Output : 720

Below is the required implementation:

declare

-- declare variable num , fact
-- and temp of datatype number
 num number := 6;
 fact number := 1;
 temp number;

begin

temp :=num;

-- here we check condition
-- with the help of while loop
while( temp>0 )
loop
fact := fact*temp;
temp := temp-1;

end loop;

dbms_output.put_line('factorial of '|| num || ' is ' || fact);

 end;

-- Program End

Output :

factorial of 6 is 720.