Deck 5: Dowhile Control Structuretrailer Record Logic

Question 1

A variable whose value does not change during program execution is called a

A)constant
B)named constant
C)static variable
D)initialized variable

Answer 1

B

Question 2

How many times will the loop steps in the instructions corresponding to the following pseudocode be executed,assuming 5 values - 5,6,7,3,0 - are input,one on each record?
Read SCORE
DOWHILE SCORE $> 0$
Write SCORE
ENDDO

A)0
B)4
C)5
D)infinite

Answer 2

infinite

Question 3

How many times will the loop steps in the instructions corresponding to the following pseudocode be executed,assuming 5 values - 0,6,7,3,0 - are input,one on each record?
DOWHILE SCORE $> 0$
Read SCORE Write SCORE
ENDDO

A)0
B)5
C)unknown
D)infinite

Answer 3

unknown

Question 4

What type of line is placed within the loop and outputs information about an individual record?

A)heading
B)detail
C)total
D)both b and c

Question 5

What value of COUNT will be output after the instructions corresponding to the following pseudocode are executed,assuming 7 values - 5,6,7,3,0,4,2 - are input,one on each record?
$$\begin{array} { l } \text { COUNT } = 0 \\\text { SUM } = 0 \\\text { VALUE } = 1 \\\text { Read VALUE } \\\text { DOWHILE VALUE } > 0 \\\text { Write Value } \\\quad \text { SUM } = \text { SUM } + \text { VALUE } \\\quad \text { COUNT } = \text { COUNT } + 1 \\\quad \text { Read VALUE } \\\text { ENDDO } \\\text { Write SUM, COUNT }\end{array}$$

A)4
B)5
C)6
D)7

Question 6

In trailer record logic a counter is used to control the loop.

Question 7

How many times will the loop steps in the instructions corresponding to the following pseudocode be executed,assuming 5 values - 5,6,7,3,0 - are input,one on each record?
Read SCORE
DOWHILE SCORE $> 0$
Read SCORE
Write SCORE
ENDDO

A)0
B)4
C)5
D)infinite

Question 8

A trailer record is also called a(n)

A)constant data value
B)sentinel value
C)9s record
D)EOF record

Question 9

The loop read is always executed more than one time.

Question 10

What value of COUNT will be output after the instructions corresponding to the following pseudocode are executed,assuming 7 values - 5,6,7,3,0,4,2 - are input,one on each record?
$$\begin{array} { l } \text { COUNT } = 0 \\\text { SUM } = 0 \\\text { VALUE } = 1 \\\text { DOWHILE VALUE } > 0 \\\text { Read VALUE } \\\text { Write Value } \\\text { SUM } = \text { SUM } + \text { VALUE } \\\text { COUNT } = \text { COUNT } + 1\end{array}$$
ENDDO
Write SUM, COUNT

A)4
B)5
C)6
D)7

Question 11

What value of COUNT will be output after the instructions corresponding to the following pseudocode are executed,assuming 7 values - 5,6,7,3,0,4,2 - are input,one on each record?
$$\begin{array} { l } \text { COUNT } = 0 \\\text { SUM } = 0 \\\text { VALUE } = 1 \\\text { DOWHILE VALUE } > 0 \\\text { Write Value } \\\quad \text { SUM } = \text { SUM } + \text { VALUE } \\\text { COUNT } = \text { COUNT } + 1 \\\text { Read VALUE } \\\text { ENDDO } \\\text { Write SUM, COUNT }\end{array}$$

A)4
B)5
C)6
D)7

Question 12

A total line is a line of output associated with one input record.

Question 13

The empty file condition can occur in both header record logic and trailer record logic.

Question 14

The priming read is placed

A)before the loop
B)within the loop as the first statement
C)within the loop as the last statement
D)after the loop

Question 15

The loop read in a loop controlled using trailer record logic is placed

A)before the loop
B)within the loop as the first statement
C)within the loop as the last statement
D)after the loop

Question 16

How many times will the loop steps in the instructions corresponding to the following pseudocode be executed,assuming 5 values - 0,8,6,3,0 - are input,one on each record?
Read SCORE
DOWHILE SCORE $> 0$
Write SCORE
Read SCORE
ENDDO

A)0
B)4
C)5
D)infinite

Question 17

What statement(s)are unnecessary in the following pseudocode?
$\mathrm { COUNT } = 0$
SUM $= 0$
Read VALUE
DOWHILE VALUE $> 0$
SUM $=$ SUM + VALUE
COUNT $=$ COUNT + 1
Read VALUE
ENDDO
Write SUM

A)COUNT = 0 and COUNT = COUNT + 1
B)SUM = 0 and SUM = SUM + VALUE
C)The first Read VALUE
D)The second Read VALUE

Question 18

Where is the write statement for a total line generally placed?

A)before the loop
B)within the loop as the first statement
C)within the loop as the last statement
D)after the loop

Question 19

The automatic end-of-file facility is implemented differently in different programming languages.

Question 20

How many times will the loop steps in the instructions corresponding to the following pseudocode be executed,assuming 5 values - 5,6,7,3,0 - are input,one on each record?
Read SCORE
DOWHILE SCORE $> 0$
Write SCORE
Read SCORE
ENDDO

A)0
B)4
C)5
D)infinite

Question 21

If you are using the automatic end-of-file facility,you need to include a special record at the end of the input denoting that there is no more data to process.

Question 22

Line count and page count are special types of trailer records.

Question 23

The priming read is usually placed as the first step within the loop.

Question 24

A line that outputs the average grade for each student can be considered in some cases,both a detail line and a total line.

Question 25

A detail line is usually written after the loop is exited.

Question 26

In trailer record logic the number of times the loop will be executed is preset.

Question 27

The loop read in a loop controlled using trailer record logic is usually placed as the last step in the loop.

Question 28

A heading line serves as a title to a report that is output.

Question 29

The use of named constants makes an algorithm more flexible.

Question 30

A trailer record must contain special information that differentiates it from the rest of the input.