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COMPUTER SCIENCE 255


FIRST HOUR EXAM








NAME ________________________




					










							Friday, Sept. 24
							10:00 AM
							100 pts.


1.	Briefly describe the four divisions of a COBOL program (10 pts.)


IDENTIFICATION DIVISION









ENVIRONMENT DIVISION









DATA DIVISION









PROCEDURE DIVISION

2.	What do the letters in COBOL stand for? (5 pts.)







3.	Suppose that you have a program called INVENTORY.COB.  What commands 
would you type on the VAX to compile, link, and run the program? (5 
pts.)










4.	Name the three basic control structures (5 pts.)








5.	Translate the following COMPUTE statement into ADD, SUBTRACT, 
MULTIPLY, and DIVIDE statements (using only those necessary).  Invent 
any new variable names you need, but make sure that the values of A, B, 
C, and D are unchanged. Don't worry about the PICTURE clauses for any of 
the variables (including the ones you invent)  (5 pts.)

	COMPUTE X = (A + B) / (C - D) END-COMPUTE.

6.	Suppose that we have the following:

A	PIC XXX	VALUE "ABC".
B	PIC 999V999	VALUE 123.456
C	PIC 99V99	VALUE 12.34

D	PIC ZZ,ZZ9.999
E	PIC 99.99
F	PIC 99V99
G	PIC XBX/X
H.	PIC XXX

	What would be the result of the following MOVE statements (i.e., what 
would the destination field look like if it were printed)?  Be careful to 
indicate the location of any spaces. (10 pts.)


MOVE A TO G




MOVE A TO H




MOVE B TO D




MOVE C TO D




MOVE B TO E




MOVE C TO F


7.	File description (15 pts.)

Suppose that the file "PARTS.DAT" contain records as follows:

PNO field consisting of
	AISLE	two characters alphanumeric
	SHELF	one character alphabetic
	BIN		two characters numeric

PNAME 		ten characters alphanumeric

AMT			three numeric digits

UNIT-COST		a dollar amount < $999.99.  Use an 
understood
			decimal place.

Write a record description for this file.

8.	A complete COBOL program

On this and the following pages, you will be asked to write a 
complete COBOL program to solve the following problem:

The file "CLASS.DAT" contains records organized as follows:

	STUDENT-NAME 	ten characters alphanumeric
	EXAM-1		three digit numeric
	EXAM-2		three digit numeric
	EXAM-3		three digit numeric

The file is terminated by a sentinel record with STUDENT-NAME all 
"Z"'s.  You are to write a program which will read the records in this 
file and which will print a line for each student with the student's 
name, exam scores, and exam average.  Output is to be directed to 
the file "OUTPUT.LIS".  Do not worry about headers or footers for this 
program, and for this program no internal documentation (comments) 
are necessary).

1.	(5 pts.)	Give the IDENTIFICATION DIVISION for this program.

2.	(5 pts.)	Give the ENVIRONMENT DIVISION for this program.

3.	(15 pts.)	Give the DATA DIVISION for this program

4.	(20 pts.)	Give the PROCEDURE DIVISION for this program.