How to use variables with

Question

I need to get the number of lines in internal table, which would
be easy, using DESCRIBE TABLE itab LINES lines. But the problem
is, that I get the name of this internal table in the field of
another internal table, so I have to use the name of internal
table as variable, but I don't know how to use variables with
DESCRIBE TABLE (or if this is possible).

Answer 1

Hi,
REPORT ZPRUEBA782 .
define two tables with diferent structures.
data: begin of table1 occurs 0,
registro type i,
end of table1.
data: begin of table2 occurs 0,
registro type i,
repid like sy-repid,
end of table2.
data: rows type i.
start-of-selection.
fill them with data
do 1000 times.
table1-registro = sy-tabix.
append table1.
enddo.
do 1757 times.
table2-registro = sy-tabix.
table2-repid = sy-repid.
append table2.
enddo.
call a form that receives as input the table and returns the number
of rows as output.
perform howmanyrows tables table2 changing rows.
break-point. "evaluate the number of rows
perform howmanyrows tables table1 changing rows.
break-point. "evaluate the number of rows
end-of-selection.
form howmanyrows tables itable changing rows.
rows = 0.
loop at itable.
add 1 to rows.
endloop.
endform.
You can try it if you don't find a better solution.
Cheers,
Chaitanya.