# Find the factorial of a number in pl/sql

Given a number, your task to print the factorial of that number using pl/sql.

Examples:

```Input : 5
Output : 120
```

Explanation:
5! = 5 * 4 * 3 * 2 * 1 = 120

```Input : 4
Output : 24
```

Basic structure of pl/sql block

```declare
-- declare all the variables

begin  -- for start block
-- make a program here

end -- for end block
```

The program of factorial of a number in pl/sql is given below:

 `declare`  `-- it gives the final answer after computation ` `fac number :=1;    ` ` `  `-- given number n ` `-- taking input from user ` `n number := &1;    ` ` `  `-- start block ` `begin`          ` `  `-- start while loop     ` `while n > 0 loop   ` ` `  `-- multiple with n and decrease n's value ` `fac:=n*fac;         ` `n:=n-1;            ` `end` `loop;          ` `-- end loop ` ` `  `-- print result of fac ` `dbms_output.put_line(fac);   ` ` `  `-- end the begin block ` `end``;               `

Output:(if given input as 5)

```120
```
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