Deck 8: Dountil Control Structure

Question 1

If condition q is NUM < VALUE,what is condition not q?

A)VALUE < NUM
B)VALUE > NUM
C)NUM = VALUE
D)NUM ≥ VALUE

Answer 1

D

Question 2

What is the value of the variable ACCUM after instructions corresponding to the following pseudocode are executed?
$\mathrm { ACCUM } = 1$
COUNT $= 0$
DOUNTIL COUNT $\geq 4$
$\mathrm { ACCUM } = \mathrm { ACCUM } + \mathrm { ACCUM }$
COUNT $=$ COUNT + 1
ENDDO

A)8
B)16
C)32
D)64

Answer 2

16

Question 3

If the value input for START is 8,how many times will the loop steps in instructions corresponding to the following pseudocode be executed?
Read START
COUNT $=$ START
DOUNTIL COUNT $<$ START COUNT $=$ COUNT - 1
Write COUNT
ENDDO

A)0
B)1
C)8
D)infinite

Answer 3

1

Question 4

A DOWHILE loop is more flexible than a DOUNTIL loop.

Question 5

If condition q is NUM ≤ VALUE,what is condition not q?

A)VALUE > NUM
B)NUM > VALUE
C)VALUE = NUM
D)NUM ≥ VALUE

Question 6

A DOWHILE loop is composed of a combination of the SIMPLE SEQUENCE control structure and the DOUNTIL control structure.

Question 7

If the value input for START is 8,how many times will the loop steps in the instructions corresponding to the following pseudocode be executed?
Read START
COUNT $=$ START
DOUNTIL COUNT $\geq$ START COUNT $=$ COUNT - 1 Write COUNT
ENDDO

A)0
B)1
C)8
D)infinite

Question 8

To create a properly formed DOUNTIL loop you must

A)place the loop test after any other step in the loop
B)place the loop steps in the YES path of the loop test
C)indicate that the loop will exit in the NO path of the loop test
D)all of the above

Question 9

What is the value of ANSWER after the instructions corresponding to the following pseudocode are executed?
$$\begin{array} { l } \text { COUNT } = 1 \\\text { SUM } = 3 \\\text { DOUNTIL COUNT } \leq 1 \\\quad \text { SUM } = \text { SUM } + \text { COUNT } \\\quad \text { COUNT } = \text { COUNT } - 1 \\\text { ENDDO } \\\text { ANSWER } = \text { SUM }\end{array}$$

A)3
B)4
C)5
D)6

Question 10

When a DOUNTIL loop is encountered during processing,the steps in the DOUNTIL loop must be executed at least once.

Question 11

What is the value of ANSWER after the instructions corresponding to the following pseudocode are executed?
$\mathrm { COUNT } = 0$
$\mathrm { SUM } = 100$
DOUNTIL COUNT $\geq 5$
$\mathrm { SUM } = \mathrm { SUM } + 5$
COUNT $=$ COUNT + 1
ENDDO
ANSWER $= \mathrm { SUM }$

A)5
B)100
C)105
D)125

Question 12

If the value input for START is 8,how many times will the loop steps in instructions corresponding to the following pseudocode be executed?
Read START
COUNT $=$ START
DOUNTIL COUNT $\leq$ START COUNT $=$ COUNT + 1
Write COUNT
ENDDO

A)0
B)1
C)8
D)infinite

Question 13

In a DOUNTIL loop the priming read is placed at the beginning of the loop steps.

Question 14

How many values will be output when the instructions corresponding to the following pseudocode are executed?
$\mathrm { ACCUM } = 1$
$\mathrm { COUNT } = 0$
DOUNTIL COUNT $> 4$
$\mathrm { ACCUM } = \mathrm { ACCUM } + \mathrm { ACCUM }$ COUNT $=$ COUNT + 1
Write ACCUM
ENDDO

A)4
B)5
C)8
D)16

Question 15

What is the value of ANSWER after the instructions corresponding to the following pseudocode are executed?
$$\begin{array} { l } \text { COUNT } = 5 \\\text { SUM } = 100 \\\text { DOUNTIL COUNT } < 5 \\\quad \text { SUM } = \text { SUM } + 5 \\\quad \text { COUNT } = \text { COUNT } - 1 \\\text { ENDDO } \\\text { ANSWER } = \text { SUM }\end{array}$$

A)5
B)100
C)105
D)125

Question 16

What is the value of ANSWER after the instructions corresponding to the following pseudocode are executed?
$\mathrm { COUNT } = 2$
SUM $= 100$
DOUNTIL COUNT $> 5$
$\mathrm { SUM } = \mathrm { SUM } + 5$
COUNT $=$ COUNT + 1
ENDDO
ANSWER $=$ SUM

A)110
B)115
C)120
D)125

Question 17

What type of loop is always executed a predetermined number of times?

A)DOWHILE
B)DOUNTIL
C)both a and b
D)neither a nor b

Question 18

Which of the following is not one of the basic control structures?

A)SIMPLE SEQUENCE
B)IFTHENELSE
C)DOWHILE
D)DOUNTIL

Question 19

A DOUNTIL loop is a leading-decision program loop.

Question 20

If condition q is NUM ≠ VALUE,what is condition not q?

A)VALUE > NUM
B)NUM > VALUE
C)VALUE = NUM
D)NUM ≥ VALUE

Question 21

To create a properly formed DOUNTIL loop on a program flowchart you must place the loop test after all the steps within the loop.

Question 22

A DOUNTIL loop cannot be used if automatic end-of-file processing is needed to control the loop.

Question 23

The steps within a DOUNTIL loop are always placed on the line after DOUNTIL and are indented a few positions for clarity.

Question 24

In header record logic the DOUNTIL loop is not controlled by a counter as it is with a DOWHILE loop.

Question 25

To create a properly formed DOUNTIL loop you must place the loop steps in the YES path of the loop.

Question 26

In a trailing-decision program loop,the test for the loop terminating condition is not made until the other processing steps in the loop have been executed.

Question 27

A connector symbol must be placed at the entry point of a DOUNTIL loop just as it is placed at the entry point of a DOWHILE loop.

Question 28

In pseudocode,the DOUNTIL statement is positioned after the loop steps.

Question 29

The READ statement used to input the header record must be placed before the DOUNTIL loop test.

Question 30

A DOUNTIL loop is exited when the tested condition is true.