Assignment 2 Instructions

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Assignment 2
80 points
For this assignment you will write a program that reads in an unknown number of lines, each containing 3-digit
numbers, 4 per line. For each line read, print out the numbers W, X, Y and Z, calculate the value of W - X + Y - Z
and print the result, single-spaced.
Each line has the following format:
columns
columns
columns
columns
columns
columns
columns
columns
columns

1-3
4-6
7--9
10-12
13-15
16-18
19-21
22-24
25-80

blank
first number W
blank
second number X
blank
third number Y
blank
fourth number Z
blank

When all processing is done, skip a line and then print the sum of the result values from all of the lines and the
number of lines read.
Write your program incrementally! That means that you should begin by just reading one record and print out
those numbers. When that works, put in a loop. If you get one part working before moving on to the next, your
debugging will be much easier and less time-consuming.
Use a top driven loop:
Initialize the counter and the total
Top of the loop
Read a record
If end-of-file, branch to the end of the loop
Deal with the record just read using XDECI, arithmetic, XDECO and XPRNT
Add 1 to the counter
Add the result (W - X + Y - Z) of the numbers read to the total
Branch to the top of the loop
End of the loop
Use XDECO and XPRNT to print the summary lines

You will need to put labels on two lines, one for the top of the loop and one for the bottom of the loop. You can
actually put a label on any line of code, but many people put them on lines that don't do anything else, like this:
MYLABEL

DS

0H

Here DS 0H takes up no space. (It declares 0 halfwords on a halfword boundary, and as each instruction is an
even number of bytes, the location will already be on a halfword boundary.)
JCL for this assignment
Use the following JCL:
//KCnumberA JOB ,'Your Name',MSGCLASS=H
//STEP1
EXEC PGM=ASSIST
//STEPLIB
DD DSN=KC02293.ASSIST.LOADLIB,DISP=SHR
//SYSPRINT
DD SYSOUT=*
//SYSIN
DD *

************************************************************
*
* Program:
ASSIGN2
* Programmer: Your Name
*
* Register usage:
*
************************************************************
(Your program goes here.)
/*
//FT05F001
DD *
005
005
005
005
006
001
002
004
0
+7
2
-45
100
088
035
10
0
0
0
0
10
-10
10
-10
500
230
9
58
516
853
0
17
020
0
245
316
529
977
681
0
013
250
85
831
0
364
275
0
887
100
293
993
234
447
591
13
-89
-7
23
104
001
002
003
004
008
007
006
005
999
998
997
996
/*
//FT06F001
DD SYSOUT=*
//

As before, you will need to replace "Your Name" with your own name, and you will need to replace "KCnumber"
with your own logon ID.
Your actual code should be after the comment box and before the /* line.
Data
As indicated above, the data is listed in the source code file between the FT05FT001 line and the following /*
line.
This is known as instream data. It is also possible to read from a specific disk file by name, and we will do so
later.
Other requirements
In the JCL, at the very beginning of the program is a comment box. Notice the place that says "Register Usage".
Make a list here of registers you used and how you made use of each one. For instance, you will be using register
15 as your base register, and register 1 is used by XDECI. Thus you might have:
*
*
*
*
*

Register usage:
1
Used by XDECI
15
Base register

and probably several more such lines.

The comment box should also list your name and the number of the assignment (Assignment 2).
To use XREAD, you will need to have an 80-byte field to contain each line you read.
To produce the output, you will need to define a couple of output lines containing DC and DS statements (with
labels on the DS statements).
Your program should include line documentation. At the end of each line (certainly for most lines) skip one or
more spaces and insert a few words describing what that instruction does. Try to line these up so they start in the
same column. For instance:
SR
SR

2,2
6,6

Initialize counter.
Initialize total.

Name your program file something like "ASSIGN2" or "ASSIGN2".
Submit your program file and output file through Blackboard.
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