True/False
Indicate whether the
statement is true or false.
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1.
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The repetition structure is used to repeatedly process one or more program
instructions until some condition is met, at which time the structure ends.
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2.
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You should not nest repetition structures.
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3.
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The difference between pretest and posttest loops is that in posttest loops the
condition is not evaluated with each iteration of the loop, whereas in pretest loops it is.
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4.
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Depending on the result of the evaluation, the instructions in a posttest loop
may never be processed.
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5.
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Of the two types of loops, the posttest loop is the most commonly used.
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6.
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Not every problem requires a loop in its solution.
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7.
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With very rare exceptions, every loop has a loop condition and a loop
body.
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8.
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A loop condition must result in either a true or false answer only.
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9.
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Values used to end loops are sometimes called trip values.
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10.
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All loops require the user to enter a special value to end the loop.
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11.
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In a loop, the sentinel value should be one that is easily distinguishable from
the valid data recognized by the program.
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12.
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In a pretest loop, when the loop condition evaluates to false, the loop body is
processed; otherwise, the loop body instructions are skipped over.
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13.
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In flowcharts, the parallelogram is the selection/repetition symbol.
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14.
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In a repetition structure, when the loop condition evaluates to false, the
computer skips over the loop instructions and processing continues with the instruction immediately
following the end of the loop.
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15.
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When coding the while statement, some C++ programmers
include the braces even when the loop body contains only one statement.
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16.
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The loop condition of the while statement cannot
contain arithmetic operators.
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17.
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It is a good programming practice to use a comment, such as //end while, to mark the end of the while
statement.
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18.
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A loop that processes its instructions indefinitely is referred to as an
infinite loop.
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19.
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An accumulator is always incremented by a constant value, whereas a counter is
incremented by a value that varies.
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20.
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You cannot use a pretest loop to create a counter-controlled loop.
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21.
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The while statement provides a more compact way of
writing a counter-controlled loop than the for statement.
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22.
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The second argument in the for clause usually
contains an expression that updates the counter variable specified in the initialization
argument.
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23.
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In the for statement, if the loop body contains more
than one statement, the statements must be entered as a statement block.
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24.
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In C++, x++ is equivalent to x =
x + 2;
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25.
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If you omit the loop condition argument in the for
clause, you need to include the break statement in the loop body to stop
the loop.
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Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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26.
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Pretest loops are also called ____ loops.
a. | top-driven | c. | primary | b. | bottom-driven | d. | secondary |
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27.
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The repetition structure is referred to more simply as a ____.
a. | multi-path | c. | loop | b. | case | d. | switch |
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28.
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Posttest loops are also called ____ loops.
a. | top-driven | c. | primary | b. | bottom-driven | d. | secondary |
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29.
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In a ____ loop, the evaluation occurs after the instructions within the loop are
processed.
a. | for | c. | posttest | b. | pretest | d. | while |
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30.
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The instructions in a ____ loop will be processed at least once.
a. | for | c. | pretest | b. | while | d. | posttest |
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31.
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The instructions within a loop are referred to as the loop ____.
a. | statement | c. | block | b. | body | d. | iterator |
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32.
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Values that are used to end loops are referred to as ____ values.
a. | iterator | c. | break | b. | sentinel | d. | accumulator |
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33.
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After each processing of the loop body instructions, the loop ____ is
reevaluated to determine whether the instructions should be processed again.
a. | condition | c. | iterator | b. | body | d. | sentinel |
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34.
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In a loop, the ____ read is used to prepare or set up the loop.
a. | sentinel | c. | priming | b. | accumulator | d. | initialization |
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35.
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In a flowchart, the repetition symbol contains the loop ____.
a. | condition | c. | iterator | b. | body | d. | sentinel |
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36.
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In a flowchart, the repetition symbol has ____ flowline(s) leading into the
symbol.
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37.
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You can code the pretest loop in C++ using the ____ statement.
a. | repeat | c. | for | b. | switch | d. | do while |
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38.
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When coding the while statement in C++, the loop
condition must be a(n) ____ expression.
a. | arithmetic | c. | logical | b. | relational | d. | Boolean |
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39.
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You create a statement block by enclosing the statements in a set of
____.
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40.
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A loop that processes its instructions indefinitely is referred to as a(n) ____
loop.
a. | endless | c. | accumulating | b. | non-sentinel | d. | incorrect |
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41.
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Usually, you can stop a program that contains an infinite loop by pressing
____.
a. | Ctrl+e | c. | Ctrl+s | b. | Ctrl+c | d. | Ctrl+x |
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42.
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A(n) ____ is a numeric variable used for counting something, such as the number
of employees paid in a week.
a. | sentinel | c. | counter | b. | iterator | d. | accumulator |
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43.
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A(n) ____ is a numeric variable used for adding together something, such as the
total dollar amount of a week’s payroll.
a. | sentinel | c. | counter | b. | iterator | d. | accumulator |
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44.
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____ means to assign a beginning value to a counter or accumulator
variable.
a. | Initializing | c. | Flushing | b. | Iterating | d. | Accumulating |
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45.
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Updating, also called ____, means adding a number to the value stored in the
counter or the accumulator.
a. | incrementing | c. | flushing | b. | iterating | d. | accumulating |
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46.
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The most common use for the for statement is to code
pretest loops whose processing is controlled by a(n) ____.
a. | flag | c. | accumulator | b. | counter | d. | sentinel |
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47.
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The for statement begins with the for clause, which contains ____ arguments separated by semicolons.
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48.
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In most for clauses, the ____ argument creates and
initializes a counter variable.
a. | first | c. | third | b. | second | d. | last |
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49.
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In a for clause, the ____ argument specifies the
condition that must be true for the loop to continue processing the loop body instructions.
a. | first | c. | third | b. | second | d. | last |
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50.
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A common error made by C++ programmers is to separate the arguments in the for clause with ____.
a. | colons | c. | commas | b. | semicolons | d. | dashes |
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