True/False Indicate whether the
statement is true or false.
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1.
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The characters in a string variable, as defined in the book using the apstring
library, can be examined/modified using a for loop.
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2.
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When a true loop controls a condition that is never changed to false then an
infinite loop is caused.
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3.
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Nesting of the three kinds of loops - do...while, while and for - are not
permitted.
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4.
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A sentinal value is a value which can cause a loop exit, but is not controlled
by a loop variable.
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5.
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A for loop is a pre-test loop.
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6.
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A while loop must always be executed at least once.
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7.
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A for loop can always be rewritten as a while loop.
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8.
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A while loop can always be rewritten as a do..while loop with the same
results.
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9.
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Somewhere in a while loop, provision must be made for the value of the tested
expression to be altered.
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10.
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Initial values for the variables in the tested expression of a while
statement do not have to be initialized before the while statement is encountered.
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11.
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Sentinels are data values used to signal either the start or the end of a data
series.
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12.
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Once a while loop is entered, the statements within the compound
statement are executed as long as the tested condition is true.
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13.
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(; count <= 20;) is valid for the contents of a
for statement’s parentheses.
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14.
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for loop variables can be declared and initialized within a for
loop initializing list.
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15.
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A loop contained within another loop is a nested loop.
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Multiple Choice Identify the
choice that best completes the statement or answers the question.
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16.
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Which is not a part of the for loop heading?
a. | initialization expression | c. | statement | b. | continuation
condition | d. | update
expression |
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17.
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Which part of the for loop heading increments/decrements the control
variable?
a. | update expression | c. | initialization expression | b. | continuation
condition | d. | statement |
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18.
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Which part of the for loop heading determines the upper bound of the control
variable?
a. | initialization expression | c. | update
expression | b. | statement | d. | continuation condition |
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19.
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Which of these operators are unary?
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20.
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For the block of code below, which could be a precondition:totalSum = 0;
? for (inc = 0; inc <= area * 2;
++inc) totalSum = totalSum + (3.1415 * (1/4));
a. | totalSum = 0 | c. | inc = 0 | b. | area * 2 | d. | 3.1415 |
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21.
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Which is not a loop structure?
a. | for | c. | while | b. | do..while | d. | select |
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22.
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An accumulator is ____.
a. | data validator | c. | a variable that sums values | b. | a variable whose
value never changes | d. | a
variable that decrements values |
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23.
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Which should not be an attribute of a loop control variable?
a. | double | c. | char | b. | int | d. | variable
declaration |
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24.
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Which of the following is an example of a properly written for statement?
a. | for (int M = 1.5; M < 10;
M--) | b. | for (int C = 2; C < 10; C) | c. | for ( int Num > 10; N = 0; N++) | d. | for (int J = 20; J < 2; J--) |
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25.
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In a for loop, ____.
a. | a variable of type float can be used to control execution | b. | the loop variable
must always be 1 the first time the loop is executed | c. | the loop stops executing when the terminating
condition becomes false | d. | the loop stops executing when the terminating
condition becomes true |
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26.
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What is the output of the following for loop? for (int Y = 2; Y<=10;
Y++)
cout <<Y << " ";
a. | 1 2 3 4 5 6 7 8 9
10 | c. | 2 4 6 8 10 | b. | 2 3 4 5 6 7
8 9 10 | d. | 2
3 4 5 6 7 8 9 |
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27.
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In a ____ loop, the loop control variable is usually increased by one each time
through the loop.
a. | do...while | c. | for | b. | forward | d. | while |
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28.
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How many times will this loop execute? for (int a = 2; a <= 4; a++) for (int b = 1; b
<= 5; b++)
cout
<< a << " " << b << endl;
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29.
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The real power of most computer programs resides in their ability to repeat the
same calculation or sequence of instructions over and over, each time using different ____ , without
the necessity of rerunning the program.
a. | data | c. | compilers | b. | programming languages | d. | interpreters |
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30.
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The while statement literally loops back on itself to recheck the
expression until ____.
a. | the program is terminated | c. | instructed to
stop | b. | it evaluates to zero | d. | new data is entered |
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31.
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Unless there is a change in the value of the tested expression of a while
loop, the loop will ____.
a. | terminate after the first execution | c. | terminate
immediately | b. | create an error message | d. | execute indefinitely |
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32.
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Every time the statement sum = sum + num; is executed the previous value
of sum is ____.
a. | saved | c. | stored | b. | lost | d. | tested |
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33.
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Repeatedly adding numbers to a total usually involves interactive user input,
____ and an accumulator.
a. | an argument | c. | a repetition statement | b. | a
parameter | d. | addition |
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34.
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Sentinel values must be selected so as not to conflict with ____.
a. | legitimate data values | c. | other sentinels | b. | program logic | d. | stored data |
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35.
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The ____ statement performs the same function as the while statement but
uses a different form.
a. | if | c. | continue | b. | if-else | d. | for |
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36.
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Within the parentheses of the for statement are ____ items separated by
semicolons.
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37.
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Omitting the tested expression from a for loop results in ____.
a. | a crashed program | c. | a read error | b. | a print error | d. | an infinite
loop |
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38.
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All statements in a do loop are executed at least ____.
a. | once | c. | three times | b. | twice | d. | four times |
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39.
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while and for statements are sometimes preferred to do
statements because ____.
a. | they are shorter | c. | they are more efficient | b. | they are
faster | d. | their expression
testing is more visible |
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40.
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The equality operator should not be used when testing ____ operands.
a. | integer | c. | character | b. | double-precision | d. | embedded |
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41.
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Consider the following do while loop, whose job is to check for a valid
customer identification number between the numbers 100 and 1999: do { cout
<< "\nEnter an identification number: "; cin >>
idNum; } while ( // Missing expression goes here);
Which of the following is the correct
missing expression?
a. | idNum >= 100 && idNum <= 1999 | c. | idNum < 100 || idNum !=
2000 | b. | idNum < 100 || > 1999 | d. | idNum < 100 || idNum > 1999 |
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42.
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Assume you need to write a code segment to output a product table showing all
products between two variables, low and high. Here is the code, minus one line: void products (int
low, int high) { int product
= 0; for (int i = low;
i<=high; i++)
{
for (int j = low; j<= high;
j++)
{
// Missing line goes
here
cout <<
product;
}
cout << endl;
} } What is the missing line?
a. | product = i+j; | c. | product = low*high; | b. | product = i*j; | d. | product =
low+high |
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43.
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Assume you need to write a posttest loop that asks the user for an integer. If
the number is non-negative, add it to a sum. If it is negative, stop the loop. Output the
sum. Here is the code, minus one statement: int sum = 0; int number =
0; do { cout <<
"Input a number (negative to stop):
"; cin >>
number; // Missing statement
goes here } while (number>= 0); cout << “The sum = ” << sum <<
endl;
What is the missing statement?
a. | if (number < 0) sum = sum + number; | b. | if (number >
0) sum = sum + number; | c. | if (number >= 0) sum = sum +
number; | d. | if (number == 0) sum = sum + number; |
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Completion Complete each
statement.
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44.
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An example of a pretest loop with variable conditions is the
____________________ loop and an example of a posttest loop with variable conditions is the
____________________ loop.
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45.
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A posttest loop has a boolean condition checked ____________________ the loop
body has been completed.
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46.
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Loops that execute a predetermined number of times are called
____________________.
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47.
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A loop that tests its controlling condition before the loop is executed for the
first time is called a(n) ____________________.
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48.
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A do...while loop is an example of a(n) ____________________.
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49.
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Assume that you are writing a program that prompts a person to enter his or her
age. When you check the value entered to make certain it is between 1 and 120, you are performing
data ____________________.
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50.
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A value used to indicate that all data has been used is called a(n)
____________________ value.
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