Assignment 3 Solution

*Overview*




For this assignment, write a program that will produce a sales report

for a company called Widgets-R-Us. They are offering discounts and free

shipping for sufficiently large orders.




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*Input*




The input to the program will be a file with an unknown number of

records. Each record represents a single sale and has the following format:




columns description

------- -----------

1 - 6 Product ID

7 - 8 spaces

9 - 15 Order ID

16 - 17 spaces

18 - 20 Number Ordered

21 - 22 spaces

23 - 26 Price Each (in cents)

27 - 80 spaces




Use the following JCL statement to specify the input file:




//FT05F001 DD DSN=KC02314.SPRING18.CSCI360.HW3DATA,DISP=SHR




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*Processing Requirements*




For this assignment, write a read loop that will process the input one

record at a time.




For each input record, print a detail line containing the input values

along with the Discount, Shipping and Total Cost (in cents).




Use the following formulas for your calculations:




PreTotal = Price Each * Number Ordered




If (PreTotal = 20000)

Then Discount = 500

Else Discount = 0

End If




If (PreTotal = 10000)

Then Shipping = 0

Else Shipping = 600

End If




Total Cost = PreTotal + Shipping - Discount




As you process records, count them and accumulate the Grand Total = sum

of Total Cost for all sales. Also count sales for which Shipping = 0.




After processing all of the input records, print summary lines which

tell us the number of sales, the number of sales with Shipping = 0, the

Grand Total and the average Total Cost per Sale.




The average Total Cost should be rounded to the nearest cent. One

possible way to do this is, after doing the division, calculate 2 times

the remainder and compare that product with the divisor. If 2 * the

remainder is greater than or equal to the divisor, then the quotient

should be rounded up up by 1.




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*Other Requirements*




1.




Use |TITLE 'Your Name, CSCI 360, Program 3'|.




2.




Use |M, D, MR, DR, LA, XREAD, XDECI, XDECO, XPRNT, L, ST, C, A, S,

AR, SR, BC| and |BCR|, as appropriate.




3.




Use at least one literal in the program.




4.




You should use line documentation, documentation boxes, and you are

welcome to use |EJECT|, and |SPACE|. You will be using various

registers, and you do need to make a list of how you are using them.




5.




Write this program incrementally. This will make it much easier to

debug. Initially write the program so that it reads and processes

one record. Once you know it does that correctly, implement the

loop. Once the loop is working correctly, add the code to count the

sales, count those with free Shipping, etc.




6.




You may find that you run short of registers if your try to use them

for all your variables. You can use fullwords in memory for some

purposes such as counters. When you want to increment the counter,

load it into a register, add 1 and store it again. That register is

not then tied up and can be used for other purposes.




7.




The JCL for the program should now look like:




//your_KC_id_plus_a_letter JOB ,'your name',MSGCLASS=H

//STEP1 EXEC PGM=ASSIST

//STEPLIB DD DSN=KC02293.ASSIST.LOADLIB,DISP=SHR

//SYSPRINT DD SYSOUT=*

//SYSIN DD *

********************************************

*

* The documentaton goes here.

*

********************************************

/*

//FT05F001 DD DSN=KC02314.SPRING18.CSCI360.HW3DATA,DISP=SHR

//




8.




When you are debugging logic errors, don't be reluctant to use XDUMP

instructions to display registers and/or memory. Once you get the

program running, remove the XDUMPs from the run that is turned in

for grading.




Feel free to test the program with your own data. To do so,

temporarily replace the JCL line that starts with "//FT05F001" by




//FT05F001 DD *

your data goes here

/*




Make sure that the run you submit for grading uses the file

specified above.




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*Other Notes*




The page header for the report should start at the top of a new page.

The column headers should be double spaced from the page header. The

sales information lines should be double spaced. The summary lines

should be triple spaced from the last sales record. Double-space between

summary lines.




Notice that we are printing amounts of money simply as numbers of cents.

Later in the course, we will have ways to format numbers more precisely.




You may need to put a label on a line now and then when you are not yet

sure what instruction should be on that line. In that case, you can just

use:




MYLABEL DS 0H




The "DS 0H" part allocates zero halfwords on a halfword boundary.

Instruction are always on a halfword boundary anyway, so this does no

harm and simply associates MYLABEL with an address. The next line will

be at the same LOC value.