Deck 5: Control Statements, Logical Operators

Question 1

Switch can be used to test:

A) int constants.
B) float constants.
C) string constants.
D) all types of constants.

Answer 1

A

Question 2

What will the following program segment do? int counter{1};
Do
{
Cout << counter << " ";
} while (++counter <= 10);

A) Print the numbers 1 through 11.
B) Print the numbers 1 through 10.
C) Print the numbers 1 through 9.
D) Cause a syntax error.

Answer 2

B

Question 3

Which of the following data types can be used to represent integers?

A) char
B) long
C) short
D) All of the above.

Answer 3

D

Question 4

Which of the following is false?

A) The three expressions in the for structure are optional.
B) The initialization and increment expressions can be comma-separated lists.
C) You must declare the control variable outside of the for loop.
D) A for loop can always be used to replace a while loop, and vice versa.

Question 5

Which of the following is false?

A) There are representational errors, when precise decimal dollar amounts and interest rates are stored as doubles.
B) There are many currencies worldwide, with different conventions for thousands separators, decimal separators, currency symbols, and more.
C) C++11's long long type supports values in the range -2,147,483,647 to 2,147,483,647 as a minimum.
D) C++11's int64_t type supports the exact range -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807.

Question 6

Float and double variables should be used:

A) To perform monetary calculations.
B) As counters.
C) To store true/false values.
D) As approximate representations of decimal numbers.

Question 7

Consider the execution of the following for loop for (int x = 1; x < 5; increment) {
Cout << x + 1 << endl;
}
If the last value printed is 5, which of the following might have been used for increment?

A) x++
B) x += 1
C) ++x
D) Any of the above.

Question 8

Which of the following is true?

A) You can initialize data members of a class only in the class's constructor.
B) C++11 allows you to provide a default value for a data member when you declare it in the class declaration.
C) You cannot initialize data members of a class.
D) None of the above

Question 9

Which of the following is correct when labeling cases in a switch structure?

A) case1:
B) Case1:
C) case 1:
D) Case 1:

Question 10

Which of the following for headers is not valid?

A) for (int i{0}; i < 10; i++)
B) int i{0}; for (; i < 10; i++)
C) for (int i{0}; int j{5}; ; i++)
D) All of the above.

Question 11

Which of the following is a poor programming practice?

A) Indenting the statements in the body of each control structure.
B) Using floating-point values for counters in counter-controlled iteration.
C) Nesting multiple iteration structures.
D) Placing vertical spacing above and below control structures.

Question 12

Which of the following is false?

A) The effects of break and continue statements can be achieved by structured programming techniques.
B) break and continue statements can make a program perform faster than with the corresponding structured techniques.
C) Many programmers feel that break and continue violate structured programming.
D) You should always try to write the fastest, smallest code possible before attempting to make it simple and correct.

Question 13

Which of the following does counter-controlled iteration require?

A) An initial value.
B) A condition that tests for the final value.
C) An increment or decrement by which the control variable is modified each time through the loop.
D) All of the above.

Question 14

Which of the following for headers produces the values from 27 through 3, decrementing by 3?

A) for (unsigned int i{27}; i <= 3; i += 3)
B) for (unsigned int i{27}; i >= 3; i -= 3)
C) for (unsigned int i{27}; i > 3; i -= 3)
D) All of the above.

Question 15

In a switch statement:

A) A break is required after each case.
B) Multiple actions in a case do not need to be enclosed in braces.
C) A default case is required.
D) A break is required after the default case.

Question 16

Which of the following is a parameterized stream manipulator used to format output?

A) setw
B) right
C) left
D) fixed

Question 17

Which of the following is false?
E) break and continue statements alter the flow of control.
F) continue statements skip the remaining statements in current iteration of the body of the loop in which they are embedded.
G) break statements exit from the loop in which they are embedded. h. continue and break statements may be embedded only within iteration statements.

Question 18

A switch statement should be used:

A) As a single-selection structure.
B) As a double-selection structure.
C) As a multiple-selection structure.
D) To replace all if…else statements.

Question 19

If a do…while structure is used:

A) An infinite loop cannot take place.
B) Counter-controlled iteration is not possible.
C) The body of the loop will execute at least once.
D) An off-by-one error cannot occur.

Question 20

If a variable is declared in the initialization expression of a for statement, then:

A) It is automatically reinitialized to zero once the loop is finished.
B) The scope of the variable is restricted to that for loop.
C) It retains its final value after the loop is finished.
D) It can not be used in any structures that are nested in that for structure.

Question 21

Variables are also known as:

A) lvalues, but can be used as rvalues.
B) lvalues, and cannot be used as rvalues.
C) rvalues, and cannot be used as lvalues.
D) Constant variables.

Question 22

The OR (||) operator:

A) Has higher precedence than the AND (&&) operator.
B) Stops evaluation upon finding one condition to be true.
C) Associates from right to left.
D) Is a ternary operator.

Question 23

Which of the following is not one of the C++ control structures?

A) if
B) switch
C) break
D) do…while

Question 24

In C++, the condition (4 > y > 1):

A) Evaluates correctly and could be replaced by (4 > y && y > 1).
B) Does not evaluate correctly and should be replaced by (4 > y && y > 1).
C) Evaluates correctly and could not be replaced by (4 > y && y > 1).
D) Does not evaluate correctly and should not be replaced by (4 > y && y > 1).

Question 25

The ____________, __________ and ____________ are the only three forms of control necessary.

A) switch, if, else.
B) sequence, selection, iteration.
C) break, continue, if…else.
D) for, while, do…while.

Question 26

The expression if (num != 65) cannot be replaced by:

A) if (num > 65 || num < 65)
B) if (!(num == 65))
C) if (num - 65)
D) if (!(num - 65))

Question 27

Of the following, which is not a logic error?

A) Not placing curly braces around the body of an if that contains two statements.
B) Using == to assign a value to a variable.
C) Failing to initialize counter and total variables before the body of a loop.
D) Using commas instead of the two required semicolons in a for header.

Question 28

Consider the following code, assuming that x is an int with an initial value of 12 if(x = 6) {
Cout << x;
}
What is the output?

A) 6
B) 12
C) Nothing.
D) A syntax error is produced.

Question 29

An example of a unary operator is:

A) The < relational operator.
B) The = assignment operator.
C) The % arithmetic operator.
D) The ! logical operator.

Question 30

An operator that associates from right to left is:

A) !=
B) ,
C) ()
D) ?:

Question 31

Which of the following is not one the rules for forming structured programs?

A) Begin with the "simplest activity diagram."
B) Any transition arrow can be reversed.
C) Any action state can be replaced by two action states in sequence.
D) Any action state can be replaced by any control statement.