Answer required for this program

[Former Member]

Hi all

can anyone gimme the answer for this program

REPORT demo_mod_tech_example_2.

DATA: num TYPE i VALUE 5,

fac TYPE i VALUE 0.

PERFORM fact USING num CHANGING fac.

WRITE: / 'Factorial of', num, 'is', fac.

FORM fact

USING value(f_num) TYPE i

CHANGING f_fact TYPE i.

f_fact = 1.

WHILE f_num GE 1.

f_fact = f_fact * f_num.

f_num = f_num - 1.

ENDWHILE.

ENDFORM.

[Former Member]

factorial of 5 is 120

[Former Member]

Hi

can u please explain the how u got the right answer??

Coz i am bit confused.

Thanks and Regards

Arun

[Former Member]

Hi Arun,

Just put a break point in the subroutine and check out what is happening

Check out the values of the variables in debugging

you will get to know

[Former Member]

Hi chandrasekar,

I know that i can debug and found it out.

I dont have access to SAP System.. if i got system i would have never raised this query.

Hope u understand.

Thanks,

Arun

[Former Member]

Factorial of 5 = 5 * 4 * 3 * 2 * 1

[Former Member]

In your form the value of f_num is 5(ie, default value) at first time and value of f_fact = 1.

and inwhile loop.

1st iteration

f_fact = f_fact * f_num. ie, 1* 5 = 5.

f_num = f_num - 1. ie, 5 -1 =4

2nd iteration

f_fact = f_fact * f_num. ie, 5* 4 = 20.

f_num = f_num - 1. ie, 4 -1 =3

3rd iteration

f_fact = f_fact * f_num. ie, 20* 3 = 60.

f_num = f_num - 1. ie, 3 -1 =2

4thiteration

f_fact = f_fact * f_num. ie, 60* 2 = 20.

f_num = f_num - 1. ie, 2 -1 = 1

Now control control reaches Endwhile as f_num not greater than 1 and returns the value of f_num(ie,120) to fac.