Could anyone explain me what this statements means??Thanks

Hi,
I just reading an ABAP program, found below statement and i am not understand about it...Could you help me?  Thanks!!!
it_file-ztext+18(5)  to  it_inbound_file-box_nbr
As it_file-ztext is an uploaded text file, i am confusing on the '18(5)'...what does this means??
Is it means that only extract the character which started from position18 and the Length is 5?? IS it???
Thanks!!

Hi
Yes, You are right
it is field offsetting
it will take just 5 characters starting from 18
example.
str = 'abcdefgh'.
str+4(2)  = ef.
<b>Reward points for useful Answers</b>
Regards
Anji

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