Interested to Buy Any Domain ? << Click Here >> for more details...
what is pointer error in rpg IV?
- 4 Answers
- 16357 Views
- CTS, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / syam
Parameters are passed between RPG or CL programs, they are
actually passed as pointers, not data. Pointer is a
variable that contains the address of another variable
Either parameter missing or parameter mismatch.
| Is This Answer Correct ? | 11 Yes | 0 No |
Answer / szeke
As i know pointers are only simple memory adresses stored in variables. There are many situation they can be used, not only passing parameters. APIs from C, dynamically allocated variables, structures.
A %TRIMR can be a pointer in the original field instead of building another instance of it. Working with orbital buffers, parsing them, break into separated fields, from another ILE language or module can be received and send by a number of pointers instead of copy the value.
Doing anything with a pointer value doesn't point to the correct location is a pointer error. All the data types represent pointers anyway, but they maintained by the compiler, not by the programmer. To forget freeing unused pointed memory areas is another type of error. The use of pointers can cause such errors like invalid data, or memory leaks, since the compiler has no idea what we store on that variable, it must believe we're right. In java, the compiler strictly checks an array out of bound pointer operation, in C++ i have the right to browse the whole memory from a simple a[2] defined array by adressing it as a[12345]. Also no expensive type checkings, so the performance is better.
I can erase a value, or don't even initialize it in the memory but the pointer will still exist and pointing into a non-defined value.
The instruction pointer is also a pointer, can be manipulated by GOTO jumps, or Subs, OOP programming languages are just abstract definitions over the same thing, basically every procedure will be called by its pointer in the memory, determined by compiler or the user, in compile time or run-time... It is called procedure pointer. To point into a variable instead of a PROC is another serious error...
So, what is the question exactly?
| Is This Answer Correct ? | 0 Yes | 0 No |
What is the purpose of the following? I 'CLOSED' C STAT01 I 'OPEN' C STAT02
Hi Friends, I need immediately answer for this: Senario is that,I am selecting records from the display and window subfile on the basis of Reason Code and some more fields but spool file not showing the same records which i have selected by display and window subfile. Q.What could be the causes(resons)to not show records properly (just selected in the display file and Window subfile)according the selection criteria of the records. Q.What would be the solutions to show records properly in the spool file just as selected in in the display file and window subfile according to the selection criteria.
how you will find an error which is not in the first page of the subfile without using rolldown key?
what key word is used when screen is re-display?
When will DUMP and DEBUG opcodes be ignored?
define the purpose of the %sst function?
How many MONMSG commands can declare in a CL program?
what does the ovrdbf command do?
What is the Function of PDM?
how can we view the entire objects and its types in a pgm?
how do you read data area in an rpg program?
how do you use commitment control in rpg program ?
RPG400 
