Managing Dynamically-Allocated Storage

*

*Calculate the new number of elements. If the index is

*greater than the current number of elements in the array

*plus the new allocation, then allocate up to the index,

*otherwise, add a new allocation amount onto the array.

C

IF

Index

> NumElems + SUBSALLOC

C

Z-ADD

Index

 

NumElems

C

ELSE

 

 

 

C

ADD

SUBSALLOC

NumElems

C

ENDIF

 

 

 

*

*Calculate the new size of the array

C

EVAL

Size = NumElems * %SIZE(DynArr)

*

*Reallocate the storage. The new storage has the same value

*as the old storage.

 

*

 

 

C

REALLOC

Size

DynArr@

 

*

 

 

*Initialize the new elements for the array.

C

1

ADD

OldElems

I

 

C

I

DO

NumElems

I

5 0

C

 

CLEAR

 

DynArr(I)

 

C

 

ENDDO

 

 

 

C

 

ENDSR

 

 

 

P DYNA_SET

E

 

 

 

 

 

 

 

 

Figure 56

(Part

4 of 5).

DYNARRAY Subprocedures

 

*=================================================================

*DYNA_GET: Return an array element.

*Function: Return the current value of the array element i￿f

*the element is within the size of the array, or

*the default value otherwise. *=================================================================

P DYNA_GET

B

 

EXPORT

 

*-----------------------------------------------------------------

 

 

 

* Input parameters for this procedure.

 

*-----------------------------------------------------------------

 

 

D DYNA_GET

PI

 

LIKE(DYNA_TYPE)

D

Index

 

5I 0

VALUE

 

*-----------------------------------------------------------------

 

 

 

* Local variables.

 

 

 

*-----------------------------------------------------------------

 

 

D Element

S

 

LIKE(DYNA_TYPE) INZ

 

*-----------------------------------------------------------------

 

 

*If the element requested is within the current size of th￿e

*array then return the element's current value. Otherwise

*the default (initialization) value can be used.

*-----------------------------------------------------------------

 

 

C

Index

IFLE

NumElems

C

 

EVAL

Element = DynArr(Index)

C

 

ENDIF

 

C

 

RETURN

Element

P DYNA_GET

E

 

 

 

 

 

Figure 56

(Part

5 of 5).

DYNARRAY Subprocedures

Chapter 9. Running a Program125

Page 149
Image 149
IBM AS/400 manual Else ADD Subsalloc, Enddo Endsr Dynaset, Dynaget Export, Ifle

AS/400 specifications

The IBM AS/400, now known as the IBM iSeries, is a midrange computer system that has been a cornerstone of enterprise computing since its introduction in 1988. Designed to provide a robust platform for business applications, the AS/400 is celebrated for its reliability, scalability, and integrated database capabilities.

One of the key features of the AS/400 is its Integrated Operating Environment, which blends hardware and software resources seamlessly. This integration allows businesses to execute diverse workloads, ranging from traditional applications to modern web-based services, all on a single platform. The operating system, OS/400 (now IBM i), offers a rich set of APIs and tools for developers, simplifying application development and management.

Another standout characteristic of the AS/400 is its built-in database, DB2 for i. This powerful relational database management system allows for efficient data handling and provides advanced features such as support for SQL, XML, and JSON, making it easier for businesses to manage their data and integrate it with other systems. The database's tight integration with the operating system enables high performance and security.

In terms of scalability, the AS/400 can accommodate small businesses as well as large enterprises, with the ability to support hundreds of users simultaneously. Its architecture allows for easy upgrades in hardware, meaning that organizations can scale their systems without replacing the entire infrastructure.

Security is another critical attribute of the AS/400. With a sophisticated security model, it offers built-in user authentication, access control, encryption, and auditing capabilities to protect data and applications from unauthorized access.

The AS/400 also supports multiple programming languages, including RPG, COBOL, Java, and PHP, giving organizations the flexibility to choose the development tools that best fit their needs. This diversity helps maintain legacy applications while also developing new ones that leverage modern technologies.

Moreover, the platform supports both traditional green-screen interfaces and modern graphical user interfaces, allowing organizations to transition smoothly into contemporary user experience paradigms.

Overall, the IBM AS/400 stands out as a resilient, flexible, and secure computing platform that enables organizations to effectively manage their business operations, streamline processes, and adapt to changing market demands. Its unique combination of integrated features and capabilities ensures that it remains relevant in today's fast-paced technology landscape.