bracket doubt

[Former Member]

hi,

i got the helpful reply below but would like to clarify.

(If var is an attribute, then you can say)

val = vessel1->var

if var is a method with a returning addition,

val = vessel->var( ).

1) why the bracket is empty also can assignment value to val?

vessel_id = vessel2->get_id( )

2) if i leave the bracket empty for call method vessel1->drive( ), i will have compile error. so at least i must put 0 in bracket.

call method vessel1->drive exporting speed_up = 50

call method vessel1->drive( 50 )

3) why point 1 can leave empty in ( ) whereas point 2 must have at least 0? get_id and drive both are method and not attribute.

4) if var is a method with a RETURNING addition then only can have this kind of assignment?

val = vessel->var( ).

which means other addition cannot have such assignment rite?

thanks

[Former Member]

hi all,

any help pls.

thanks

[Former Member]

1) why the bracket is empty also can assignment value to val?

vessel_id = vessel2->get_id( )

There may not be any IMPORTING parameters for that method , thats why the bracket is empty

2) if i leave the bracket empty for call method vessel1->drive( ), i will have compile error. so at least i must put 0 in bracket.

call method vessel1->drive exporting speed_up = 50

call method vessel1->drive( 50 )

For the method drive(50) , there should be an importing parameter , thats why it will accept the value of 50 and do the further processing of that method

[Former Member]

1.vessel_id = vessel2->get_id( )

vessel_id -

---

This is avariable which can hold the value of ID of same type

vessel2 -

---

Instance of the class

--> This is the symble to cal the method by instace.

get_id( )-----Is the method

Empty bracket shows the empty parameters of the method.Just like our subroutine.

vessel_id = vessel2->get_id( ).

Answer for above syntax is when you call the method get_id by instance it will return the "ID value" which will assign to field "vessel_id ".

2.For that method "get_id " atribute might set as this paramter is compusory.

3.For point 1 that attribute is not compulsory.

4. Yes.

Pls. reward points if useful.