On Error Snap System
A condition prefix can go on any executable statement. File DECLAREs DCL DEPTS FILE RECORD INPUT; DCL BACKUP FILE RECORD OUTPUT; DCL MASTER FILE RECORD UPDATE KEYED; DCL SYSPRINT FILE STREAM OUTPUT; Traditionally, the record length, blocking, etc., is set POINTER Addressing variable (must point to the right place!). Please try the request again. have a peek at this web-site
BY_100s can be from -99999*100 to 99999*100, in increments of 100. PL/I figures out the answer for the intermediate result to a precision that it determines before the answer is placed in the assignment statement result field. Define structures as: · ALIGNED so the BINARY fields are on even-byte boundaries, or · UNALIGNED where fields are placed without alignment consideration. There are coding examples plus some insight on good and bad usage. http://www.ibm.com/support/knowledgecenter/SSY2VQ_2.0.0/com.ibm.aix.pli.doc/ibmx2mst138.htm
Remove the ON unit, and the program will enter the ON ERROR routine then abend. Think of it as a side door to a room full of code. The two ways to define fields with BASED are illustrated below: DCL MY_BASE CHAR(10); DCL 1 MY_REDEFINE BASED(ADDR(MY_BASE)), 2 FIRST_FIVE CHAR(5), 2 SECOND_FIVE CHAR(5); DCL 1 MY_REDEFINE_WITH_POINTER BASED(MY_POINTER); 2 FIRST_FIVE CHAR(5), BIT Operations and Potential Math Errors The Exclusive OR example is just the frosting on the cake.
- Do ISPF finds using the output file f ' 99 '.
- Do not use hyphens ( - ) in names. · Use a single apostrophe ( ' ) to start and end character-string values.
- Use the next INIT CALL SETUP(5) and no one will work with you.
- I put labels on the subroutine ends.
- In every program with calculations, test for division by zero, overflows, and the other bad things that numbers can do.
- The following logic will help.
- Most programmers define it in their source code.
- There are rules for who gets served first: Operator Description = Assignment - Place the value of the variable on the right in the variable on the left. + Add -
- Look for "/*PADDING*/" in the output listing to see if this occurred.
OTHERWISE RETURN(TOPEGADATE(DATETIME)); bad input use today and END; go around again RETURN(DD||'-'||NEW_MONTH||'-'||YY); END TOPEGADATE; CICS Error Conditions The CICS command response option, RESP( ), is easy to use in PL/I. Remember offsets start at 0, not 1. Also the ability to add incrementally to a string is useful. PL/I always knows how long the string is because it's defining a two-byte counter field for PL/I's internal instruction use in front of the string which reserves 100 bytes of storage.
This is a topic to spend some time on in a real PL/I manual to understand. A parameter passed to the program is the classic example of a variable-length character string. Instead of %PAGE and %SKIP, I like to use 1 (page) or 0 (skip) for print control in column 1 of the source. More about the author FNS evaluates application timeliness as part of the Quality Control review process.
Get Strange error error.bmp [01/26] 10. Check them out. Use ON ENDFILE and ON KEY conditions as needed. But before you get too upset, the OPTIONS option of the PROCEDURE statement controls how parameters are passed.
ON ENDFILE(INPUT) EOF = '1'B; At the end of an input file. Discover More Instead of records, there's a flow of data to process. PUT LIST('I GOT TO HERE 1'); Always works for me with logic flow problems PL/I also has other tracing options that give all the subroutine names and data values (similar to Testing the shell for error handling is a good way to check out the code that never gets executed until production (when it's too late).
With VisualAge PL/I fixed binary fields may be up to 63 bits of precision Also UNSIGNED is supported as in UNSIGNED FIXED BIN(8) to talk to the C languages. If the start and length values are constant, the compiler can figure out what to do. If you're doing many numeric operations, assign the value to a FIXED DEC variable for the math. The initialization may be performed by a restricted expression.
In my experience, there is too much output. Keep the scope as limited as possible, because entry into the conditional processing is like a GOTO, in that you may not know where you came from. INPUT: PROCEDURE; ON CONVERSION BEGIN; IF ONCODE = 624 & ONCHAR = ' ' oncodes 600 to 639 apply THEN DO; ONCHAR = ' '; GO TO ERR1; END; ELSE GO It's best to have one entry point and one exit point.
It is just too hard to follow or read in a storage printout. Data Structures DATA STRUCTURES DCL 1 I_AM_A_STRUCTURE, 2 IN_THE_STRUCTURE, 3 I_AM_AN_ELEMENT CHAR(10); Refer to an element in the data structure like this (for example): I_AM_A_STRUCTURE.IN_THE_STRUCTURE.I_AM_AN_ELEMENT. PL/I is not like COBOL, where ending the ELSE with a period ends the IF group of statements.
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The syntax is as follows: DCL 1 EXAMPLE, 2 NAME_GAME UNION, the whole 3 AS_1_FIELD, 5 TOTAL_NAME CHAR(32), 3 IN_PARTS, is the sum of the parts 5 FIRST CHAR(10), 5 MIDDLE This is sometimes called a pseudo-variable because the results of the execution can be used just like a variable of the type defined in the RETURN clause of the PROC statement. Failure to pair the THEN and ELSE clauses can be a difficult error to detect. This is rarely done.
In a PACKAGE the internal subroutines are removed from the parent to become peers. Here are the three most common ON conditions encountered. This is to make programs more readable. It aids readability and limits the scope of missing END statements.
PUT DATA() Every variable in the program. In PL/I, all the elements of one row are stored, then the next row, and so on. TOPEGADATE: PROC(INDAY) RETURNS(CHAR(9)) RECURSIVE; DCL INDAY CHAR(8); DCL MYDATE CHAR(8) INIT(''); DCL 1 TODAY_STRUC BASED(ADDR(MYDATE)), 2 WHOCARES CHAR(2), 2 YY CHAR(2), 2 MM CHAR(2), 2 DD CHAR(2); DCL NEW_MONTH CHAR(3) INIT(' I hope you find your time well spent in going through the material.
Thus there's never a question of knowing the starting values. · Where possible, use subroutines like functions and have them return a value. Every program that issues a GETMAIN should issue a FREEMAIN even though CICS will free the storage when the task ends. In between, each program has all the elements found in any language: variable definitions, functions, subroutines, and other logic. Business programs that make extensive use of multi-dimensional arrays can be difficult to maintain.
When doing compares, consider overlaying the PIC definition with a CHAR string. Complex Operators With these you get two operations for the price of one and the opportunity to confuse anyone not familiar with this syntax. Hint: If you lose the pennies, look for an undeclared variable that has defaulted to DECIMAL FLOAT or FIXED BIN. There are differences.
Assignments and the IF Statement In ASSIGNMENT (=) statements, PL/I can convert almost any data type to another. It makes variable-impact analysis difficult. Unmatched END Statements LONG_DAY: PROC; IF IT_WONT_WORK THEN DO; CALL HELP; CALL POLICE; IM_OK_NOW = IT_WORKED; CALL ON_TO_BETTER_THINGS; END LONG_DAY; You forgot the END for the THEN DO. It's best to initialize the string to a length of zero (0).