Read and
follow the directions found in the Unix Tutorial.
Enter, or copy, the Future
Value Program (it can be found here). Save
this program with the filename lab1b.cob. Once you have the
program, you should compile it, and once you have a clean compile (i.e. no
errors), execute the program.
At the terminal window
(i.e. the % prompt), type ccbl lab1b.cob to
compile and link the source code file. This will create an executable file with
the name of the program plus the suffix .acu.
If you have compiler errors, go back to emacs to make
corrections, save the file, and re-compile. You must re-compile your
program after every change.
When editing your code, you
can end the emacs command with a space and ampersand
(&). This will open emacs but also return your
terminal window to the command prompt, so you can use it while emacs is open.
To get obtain a listing of
your program with the error messages beneath the line flagged as the error (i.e if you have compiler errors), you need to add options
to the compile command:
Run the program: runcbl lab1b
UNIX has an extensive,
on-line reference manual. To get more information about a command, type
"man" followed by the name of the command. For example: man
ls. For more information about man
itself, type man man. "man"
functions, just like "more" - use the space bar or the Enter key to
scroll or Ctrl-C to cancel.
Type the answers to the
following questions into a file you create named 'lab1c.txt' to be submitted
with the rest of your lab. Restore the program to its original condition before
going on to the next question.
Refer to program typed in
for Part B of this lab:
1.
Delete
the period at the end of the statement IDENTIFICATION DIVISION. Recompile
the program. What happens?
2.
Replace
one of the words DIVISION with DIVIDE. Recompile the program. What
happens?
3.
Put
the first paragraph name in all lower case. Recompile the program.
What happens?
4.
Replace
one of the 77 level numbers with 01. Recompile the program. What
happens?
5.
Delete
the periods at the end of all the statements in the 000-CALCULATE-FUTURE-VALUES
paragraph. Recompile the program. What happens?
6.
Put
a period after the first statement in the IF (the PERFORM statement).
Recompile the program. What happens? Run/Execute the program.
What happens?
7.
Comment
out the following statement: ENVIRONMENT DIVISION. Recompile the
program. What happens?
8.
Comment
out ENVIRONMENT DIVISION and INPUT-OUTPUT SECTION statements. Recompile
the program. What happens?
9.
What
are the first six statements that are executed when the program is run?
(just list the verbs of these statements in sequence)
10.
If
the user enters a zero when the first Accept statement is run, what statements
are run before the program ends? (just list the verbs)
11.
If
the user enters 2 when the first Accept statement is run, what statements are
run before the Accept statement is run again? (just list the
verbs)
12.
What
happens if the user enters 100000 and the entry is truncated?
13.
If
the Value clause for the NUMBER-ENTERED mistakenly sets the value to 0 instead
of 1, what statements will be executed before the program ends?
14.
If
the investment amount that's entered by the user is $125, the number of years
is 10 and the interest rate is 10 percent, what is the value of the
FUTURE-VALUE field after procedure 120 has been executed one time?
15.
If
the picture of the FUTURE-VALUE field is changed to S9(7),
what does this field contain after procedure 120 has been executed one time?
Use same inputs as #14.
When you are finished with
a lab, you need to turn it in for grading. The submit command submits your lab
electronically. You must use the submit command to turn in your labs; emails
and printouts are not acceptable. The submit command also puts the time on the
files that were submitted so that we know when the files were turned in.
The grader will be checking this time to determine if a lab was turned in
"on-time" or "late". The submit command is entered as
follows:
submit classname
labname files-to-submit
Where classname is the name of the CIS 314 section that
you are enrolled in.
Your classname is c314aa.
labname is the lab you are working on
(lab1, lab2, etc.)
files-to-submit is a list of the files that make up
the lab. These files include COBOL programs, input files, text files, and/or
record definitions.
Note that all of the files
in a lab must be submitted using one command. If
you use two submit commands, the second submit erases the files from the first
submit. Since the grader does not have the entire lab to grade you lose
points.
Also, note that programs
must be submitted in source code form. For example, if you submit
"lab4.acu" instead of "lab4.cob", you will have, at a
minimum, points equivalent deducted equivalent to
submitting two days late (20%).
Each submit
command must be entered on one line, without pressing Enter. If the line you
are entering is too long, it wraps onto the next line.
submit c314aa lab1
lab1b.cob lab1c.txt
As you work you create disk
files, most of which do not need to be kept. These unnecessary files occupy
disk space, and if not erased will eventually fill your disk quota. When this
happens, you can not save any other files, no matter
how important.
To help prevent this from
occurring, there is a command called clean in the class directory (/usr/class/cis314/). Copy it in to your home directory using
the UNIX cp command (see the tutorial), and every so often enter the command.
clean
This will delete any unnecessary
files from your home directory, leaving you more disk space.