In this example, you will take the input number from the user and find the factorial of a number in PL/SQL
exampleinput: 5 output: 120
factorial of 5 is 5 * 4 * 3 * 2 * 1 = 120
declare
n number;
fact number := 1;
i number := 1;
c number := 0;
begin
/* take input from the user */
n:=&n;
if(n<0)
then
/* display error when a user entered a negative number */
dbms_output.put_line('factorial of negative number does not exist');
end if;
for i in 1..n
loop
fact := fact * i;
end loop;
dbms_output.put_line('factorial of '||n||' is '||fact);
end;
/
Enter value for n: 5 old 7: n:=&n; new 7: n:=5; factorial of 5 is 120
This program is the same as above only here we have used a while loop
declare
n number;
fact number := 1;
i number := 1;
c number := 0;
begin
n:=&n;
if(n<0)
then
dbms_output.put_line('factorial of negative number does not exist');
end if;
while(i<=n)
loop
fact := fact * i;
i := i + 1;
end loop;
dbms_output.put_line('factorial of '||n||' is '||fact);
end;
/
19 / Enter value for n: 4 old 7: n:=&n; new 7: n:=4; factorial of 4 is 24
