Eval in rpg 400 software

Additionally all program described fields as above are converted to d. In rpg, we simply used the move opcode and numerictocharacter or charactertonumeric conversion was magically done for us. In rpg iv, the intermediate results computed by the eval operation assume that digits to the left of the decimal point are more important than digits to the right and since the largest result allowed is 30 positions, truncation can occur during the computation. My first cgi program a simple cgi program for the rest of us with bob cozzi support provided by rpg xtools enjoy programming again. Ibm i software developer, digital dad, as400 anarchist, rpg modernizer, alpha nerd and passionate eater of cheese and biscuits. Convert rpg iii and rpg400 source code to modernized rpg iv syntax. Flybynight software os400, i5os technical specialists.

Your partner in as400 and iseries education free your rpg jon paris jon. June 23, 2004 hey, ted thanks for the many sql tips you and others provide in four hundred guru. Designed for those new to rpg iv the primary computer language now used on the as400 this text begins at an introductory level and introduces new and more difficult topics in a building block fashion. Find answers to rpgle arrays from the expert community at experts exchange. Maybe you can explain something i have yet to figure out. We are committed to working with your staff to provide maximum benefit by fully utilizing pathfinder. Maybe this is a result of the way you pasted it into your message, but rpg is column specific for most elements. Each line of code did one and only one calculation. P in position 53 c specifies that blanks will be used in the rightmost positions c of the result field that the concatenation result, rpg 400, c does not fill. Rpg3 rpg400 rpgle in all its glorious free format styley. That way, the character format appears just as it would have, had it been output using rpg iv output specification forms and an edit code or edit word. One could add this number to that, or compare this variable to that. Actually, i think the biggest problem with the eval statement is not the eval statement itself and its use of overflows, but the method the as 400 stores numbers.

Rpg programming on the ibm i as400 and iseries subject. Rpg short form expressions the free format rpg is full of shortcuts which save you typing time. Rpg is an ibm proprietary programming language and its later versions are available only on ibm i or os400based systems. We believe there is only two reasons why you may not want to code in the freeform style. Converting numeric to character and character to numeric. At least one space must separate the pieces of the statement.

He also worked on the creation of the cobol400 compilers for the original as400s back in 1988, and was one of the key developers behind rpg iv and the code400 development tool. Slowly but surely, todays rpg programming is moving out of the familiar, comfortable environment that most of us have known. One of the cool features of rpg is the move fields logic where data is moved from input buffers to program fields and from program fields to. The expression is evaluated and the result placed in result. If you thought that rpgiv had changed over the years well you aint seen nothin yet most of us have been making extensive use of evals since they were first introduced with rpg iv. In version 3 release 7, as400 programming languages and application development tools offers a number of software solutions to help customers expand into the world of clientserver application development. Pathfinder for the iseries as400, power systems, system i preevaluation profile. Rpg400 interview questions, answers for freshers and. The rather slow acceptance of freeform rpg since its inception has been intriguing to me. Until recently, it had been difficult to convert between numeric and character values in languages other than rpg. Ok, all this works and the dataflow is actually pretty nice. In rpg iv, ibm added two operation codes that would convert numeric values into character values and allow you to mask or edit the resulting values.

For introductory and advanced courses on rpg iv in computer science and computer information system departments. Theres still times when i write software in rpg for a customer and one of their staff rpg programmers says, wow, i didnt know you could do that. My first guess is that there is some difference in your definitions causing the problem, but without the code, it is impossible to say. Whats the difference between eval and move in rpgle stack. Rpgs move fields logic, and its cousin evalcorr ibm. But the real fun begins when you combine the features. Free as400, iseries, and system i iseries downloads. The as400 application system400 was first introduced by ibm on june 21st, 1988 and later renamed to as eserver iseries in 2000, then in 2006, it was renamed as system i.

For instance, to enter an eval statement using a fixedformat c specification within. I have an old rpg progam that i had to make some changes to, so while i was at it, i updated it to rpgle. The author has included over 500 figures and he addresses other important as400 software with separate appendices for seu, pdm, dfu, sda and interactive. It has a long history, having been developed by ibm in 1959 as the report program generator a tool to replicate punched card processing on the ibm 1401 then updated to rpg ii for the ibm system3 in the late 1960s, and since evolved into an hll equivalent to cobol and pli. Using the proven and easytouse progen plus design tool you can produce both ile rpg or rpg400 programs 8 to 20 times faster. The eval operation code evaluates an assignment statement of the form result expression or result. The style here could be described as a blend of rpgii, rpgiii, and rpg400. The integrated file system is a part of os400 that supports stream inputoutput and storage management similar to personal computer and unix operating systems, while providing an integrating structure over all information stored in your server. The freeform coding style has been available for rpg iv since ibm released. There is a more recent version of this tutorial that uses a more modern form of rpg iv, with more types of freeform statements. I dug through the news400 archives and found an rpg iii and rpg400 routine published in september 1989 that generates random numbers. Rpg debug display large field content nick litten is ibm.

Migrate asset generated code to rpg free kdp software limited. Mckesson software group embraces rpg iv, ile, webfacing, and java to transform its own while also helping to transform its customers into modern, efficient, and qualitydriven healthcare. I have learned how to change a set of records in one fell swoop with the update command. You should be using the lpex editor to key in the source.

In 2008 system i got unified with system p to become power system. Eval opcode is used to evaluate any kind of expression in rpgple. I was trying to debug an ibmi web interface program ibm rpgfreeformat language that was blowing. Therefore, result cannot be a literal or constant but must be a field name, array name, array element, data structure, data structure subfield, or a string using the %subst builtin function. Pathfinder for the iseries as400, power systems, system. A programming guide to learn as400 toggle navigation as400 tutorial. Bob cozzi, a wellknown rpg expert, posed a question about how long it took to actually code the implementation of freeform to hans boldt, who evidently was on the team at ibm that developed the original implementation.

You may still maintain and create new greenscreen rpg applications, but you also are probably moving rpg programs into different environments, including those that deal with the world wide web. Dont know why i thought that, i guess i just jumped to a logical conclusion. Which is the best site to learn as400, rpg, and rpgle. The toolbox allows you to modernize your rpg programs, develop new applications faster. To display the value of any variable in hexadecimal format, simply specify. The book includes over 60 compiled rpg iv listings documented with a line by line explanation of the instructions and or annotated comments. Freeformat rpg uses many of the same operation codes. Sql statements in rpg 400 programs this example program is written in the rpg programming language.

The may 10 edition of club tech programming tips included a random number generator for rpg iv, but unfortunately, that wont work for me, as im using rpg400. Could you provide your code so that we can take a look. Rpg is a highlevel programming language for business applications. Computek consulting iseries as400 consulting and edi. Actually, i think the biggest problem with the eval statement is not the eval statement itself and its use of overflows, but the method the as400 stores numbers. I tried to get the same results in my new program using an evalh instead of two operations of mult and divh here are the variable. Handling null in rpg i am finding that i am encountering variables containing null more often as i interface data to the ibm i that originated from other software and databases. Nick litten dot com is a mixture of blog posts that can be sometimes serious, frequently playful and probably downright pointless all in the space of a day. Paris cut his teeth on the system38 way back when, and in 1987 he joined ibms toronto software lab to work on the cobol compilers for the system38 and system36.

All software necessary to run this computer is included and integrated. Welcome to it jungle is another good repository of ibm i materials. Codds relational database model, which is based on codds 12 rules, in the operating system and hardware. Almost all pc programming languages with the exception of clipper and dbase and a few others of those types store numbers in byte format. Even though rpg programmers tend to be creatures of habit, ill bet you dollars to donuts they didnt even realize the for operation code was avaiable. He learned rpg from the ground up in that environment. Rpg debug display large field content nick litten is ibmi, as400. The first reason is if you have to deploy your programs to an os400 release lower than v5r1 since freeform rpg is only supported in v5r1 and higher. The eval operation code evaluates an assignment statement of the form result expression or result op expression. C move 400 string 4 c rpg cat string temp 7 c c the following example is the same as the previous example except c that temp is defined as a 10 byte field.

This book is dedicated rpg iv programming language and the as400 environment. Mckesson software group embraces rpg iv, ile, webfacing. For example, the screen shot below shows the following program in debug mode. The thinking was that users familiar with the as400 would be comfortable using the interactive screens in our software and would require less training. Understanding evalcorr and actually using it code400. Nach weiterentwicklungen rpg ii, rpg iii, rpg 400 konnen neuere projekte inzwischen mit dem besseren rpg iv ile rpg geschrieben werden.

For that reason, a recent discussion on the rpgiv forum has been interesting. The ilerpg development environment lets you take advantage of features of rpg that are only available in ile. Eval action, which lets you write freeformat calculations. There is a big difference between these operation codes. Using the eval statement in rpg iv mc press online forums. There are a reduced number of eval dspf1 f1 statements and you can format data to your desired sizes etc just with the evalcorr statement alone. The essential guide to freeformat rpg factor 1, if there is one, follows the operation code. The new packaging options make it easy for customers to install these programs at. How to use the ile debugger to display the value of a. This tells the eval statement to show me the greqdata field in. Rpg400 technical job interview questions of various companies and by job positions. The as400 is an objectbased system with an integrated db2 database that was designed to implement e. The expression may yield any of the rpg data types. How to sort an array in descending in rpg answer surya siram while declaring the array in the rpgle program, use the key word descend and then use the bif sorta sort array to sort the array in descending order.

Halfadjusting is done by adding 5 5 if the field is negative one position to the right of the last specified decimal position in the result field. How to handle nulls is becoming one of the more popular questions i am asked. Here is a description of rounding from chapter 9, calculation specifications, of the rpg400 reference. I worked for a software development house that wanted the ibm look and feel on all of its screens. Rpg is a highlevel programming language hll for business applications. By using the code examples, you agree to the terms of the code license and disclaimer information. Rpg is an ibm proprietary programming language and its later versions are available only on ibm i or os400based systems it has a long history, having been developed by ibm in 1959 as the report program generator a tool to replicate punched card processing on the ibm 1401 then updated to rpg ii for the ibm.