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The letter "I" denotes information for REXX/imc. # I have also started adding information about OS/2 Rexx, which will be # flagged with "O" in column 1. c . In fact it is more useful to have whole words as variable names, and Rexx allows this up to an implementation maximum (which should be suitably large, e.g. 250 characters). Regards, Manas Back to top sbvw76BeginnerJoined: 28 Jan 2003Posts: 3Topics: 1 Posted: Tue Jan 28, 2003 12:47 am Post subject: Now I will narrow my query.

The REXX interpreter checks for the following 6 conditions - SYNTAX NOTREADY ERROR FAILURE HALT and NOVALUE. I used to check for RC and also used OUTTRAP. Other pieces of data may be parsed as well. "parse source" parses information about how the program was invoked, and what it is called, and "parse version" parses information about the This number may help you deduce exactly why the condition was raised.

Trapping in REXX functions/subroutines When you call some function or subroutine contained within your own script, any trapping that you've turned on prior to your call into the subroutine, is applied Here, we tell REXX to jump to the label MyError if/when a SYNTAX condition is raised: SIGNAL ON SYNTAX NAME MyError Sometimes it is useful to have different names, in case Not only does this throw away the unused tokens, but it also ensures that none of the tokens contains spaces (remember, only the last token may contain spaces; this is the CONDITION('M') will present a pop-up message box containing the error message, the name of the script in which the condition was raised, the source line and line number upon which the

Trapping HALT in a child script The Reginald interpreter allows you to trap HALT in any child script you call (as well as any other child script that the first child Doing arithmetic 3. They may also be reversed with the \ (not) operator. /* Decide what range a number is in */ pull a if a>0 & a<10 then say "1-9" if a\<10 & These implementations raise syntax error #16 (label not found) when the character case does not match.

It finds the label on line 5 - the name followed by a colon. With CALL ON, REXX does not turn trapping off. It is often a good idea to place a dot after the last variable name, thus: parse pull first second third . However, on other systems the leftover items are just thrown away.

Placing a dot instead of a variable name during tokenising causes that token to be thrown away: parse pull a . Executing commands 14. For example, /* I won't take no for an answer */ do until answer \= "NO" pull answer end Alternatively, they may be executed as long as some condition is true: Trapping is turned off, so another "signal on" will be required if you want to continue to trap that condition.

If you do not specify the name of the trap routine, Rexx uses the value of condition as the name (Rexx looks for the label ERROR:, FAILURE:, and so I O Here is how you execute that file on OS/2: O O hello O When you execute your first Rexx program using the method detailed above, you should see the If you supply the number 6 as input to the program, you should notice that the number 1/6 is given to nine significant figures. SYNTAX condition can also happen when there is some operating system failure (other than a failure concerning files/streams), such as out of memory.

If you want the interpreter to stop only when passing a label, use: trace ?l This is useful for setting breakpoints in the program, or for making the program stop at Thanks in advance. The CONDITION() function is primarily called from within your own handler. The CALL ON instruction initiates a subroutine that returns processing to the clause immediately following the CALL ON instruction.

The CALL ON instruction initiates a subroutine that returns processing to the clause immediately following the CALL ON instruction. In this case, a number may be supplied after "exit", which will be used as the exit code of the interpreter. 13. CommandsNext

Trapping Command ErrorsThe most efficient way to detect errors from commands is by creating condition traps, using the SIGNAL ON and CALL ON That explains why the "pull" instruction appeared in previous examples, and why it was that input was always uppercased if you typed letters in response to it.

to transfer control immediately to a program label to activate/deactivate a condition trap label Immediate control transfer to a program label signal labelName signal [ VALUE ] labelExpression The Your script must turn on Reginald's OPTIONS 'TRAP' once before you call the child script. In the above program, replace "arg" by "pull". REXX will jump to MyError if there is a problem. */ chars = LINEIN(,,1) /* Tell REXX to jump to MyError2 if/when the call to LINEOUT() fails. */ SIGNAL ON NOTREADY

The strict operators are == (equal to) << (less than) >> (greater than) <<= (less or equal) >>= (greater or equal) \== (not equal) \>> (not greater) \<< (not less) Conditional say x"!="factorial(x) exit factorial: /* calculate the factorial of the argument */ procedure parse arg p if p<3 then return p else return factorial(p-1) * p The variable p which holds Here is a sample run: I rexx arith O arith 5 Results are: 5 25 0.2 8 16 The results you see are the original number (5), its square (25), its O This file describes OS/2 Classic Rexx (which is also pretty much O compatible with the OS/2 Object Rexx interpreter).

Instead, it again does its default handling for SYNTAX condition. Untyped data In the previous section, you found that you could input either a number or a sequence of letters and store it in the variable a, although arithmetic can only end In addition, a pending interpret instruction is also deactivated. A HALT condition happens when the person running your script tries to manually abort your script, or some Function you call in a DLL wants your script to abort. (HALT will

In order I for this command to work, the interpreter must lie on your current PATH. If the signal was due to an error trap, then the variable "rc" will be set to an error code. /* This program goes on forever until someone stops it. */ If "beta" does appear, but "delta" does not, then everything after "beta" will be assigned to second. MVSFORUMS.comA Community of and for MVS Professionals FAQ Search Quick Manuals Register Profile Log in to check your private messages Log in Error Handling in REXX MVSFORUMS.com Forum Index

Note: The SIGL variable is created by the REXX interpreter, which assigns it a value when a condition is raised. You can easily change this. With SIGNAL ON, when REXX jumps to your handler, it turns trapping off for that condition. An error number is also displayed after the word "ERROR".

The case of letters is unimportant, so that for example "Hello", "HELLO" and "hellO" all mean the same. For example, assume you put the following line at the top of your script: SIGNAL ON SYNTAX Now, when REXX first encounters a syntax error in your script, REXX will try