Free Practice Quiz Question List

2 Variables and Data Types Online Quiz Questions

Use this free practice quiz with 20 questions to review 2 Variables and Data Types, test your knowledge, and prepare for your next test or exam.

20 questions

Choose one

1 point

Which statement correctly distinguishes initialization from assignment in C++?

A
width = 10; creates a new object and gives it its first value.
B
int width{10}; creates an object and gives it its first value.
C
width = 25; declares a new object named width.
D
int width{10}; replaces the value of an existing object.

Choose one

1 point

What value and type result from this declaration? int result{7 / 2};

A
3
B
3.0
C
3 with type int
D
3.5 with type double

Choose one

1 point

Which statement calculates a fractional per-person amount when int total{7}; and int people{2}; are already declared?

A
double per_person{static_cast<double>(total) / people};
B
double per_person{total / people};
C
int per_person{static_cast<double>(total) / people};
D
double per_person{static_cast<int>(total / people)};

Choose all

1 point

Which of the following can be valid C++ identifiers? Select all correct choices.

A
item_count
B
2nd_item
C
score2
D
Score
E
class

Choose all

1 point

Which statements correctly describe short-circuit evaluation in C++? Select all correct choices.

A
The right side of A && B is evaluated only if A is true.
B
The right side of A || B is evaluated only if A is false.
C
Both operands of && and || are always evaluated.
D
Short-circuiting can guard a division by checking that its denominator is nonzero first.
E
Short-circuiting changes an integer into a floating-point value.

True or false

1 point

True or false: After const int days_in_week{7}; has been initialized, days_in_week = 8; is an error.

A
True
B
False

True or false

1 point

True or false: Subtracting a larger value from a smaller value in unsigned arithmetic produces an ordinary negative result.

A
True
B
False

Written response

1 point

What C++ built-in type should be used for a variable that stores either true or false?

Written response

1 point

Which C++ operator produces the remainder of integer division?

Fill in the blank

1 point

Complete the description of this declaration: price{19.99}; declares a variable using .

Fill in the blank

1 point

Complete the equivalent form: x += y is equivalent to .

Open ended

1 point

Explain why 7 / 2 produces 3 in an integer expression and describe how to write the calculation so that it produces 3.5. Include why the timing of the conversion matters.

Choose one

1 point

What value does int result{2 + 3 * 4}; initialize result with, and why?

A
20 because addition is evaluated first
B
14 because multiplication has higher precedence
C
24 because the operands are evaluated from right to left
D
9 because only the first two operands are combined

True or false

1 point

In C++, converting true to an integer produces 1, while converting false produces 0.

A
True
B
False

Choose one

1 point

What value is stored in int whole{7 / 2};?

A
3
B
3.5
C
2
D
A compilation error

Choose one

1 point

Why does if (denominator != 0 && numerator / denominator > 2) avoid evaluating the division when denominator is zero?

A
The division is always evaluated before the comparison
B
The expression converts the denominator to a Boolean value
C
The division is evaluated only when denominator != 0 is true
D
The expression is invalid because && cannot combine comparisons

Choose one

1 point

Which statement would cause a compilation error after these declarations: const int maximum_attempts{3}; int attempts{0};?

A
maximum_attempts;
B
attempts += 1;
C
maximum_attempts = 4;
D
attempts = 1;

Choose one

1 point

What value is stored in double per_person{static_cast<double>(total) / people}; when int total{7}; and int people{2};?

A
3
B
3.5
C
2
D
7.0

Written response

1 point

What C++ cast syntax names the preferred general-purpose form for an explicit type conversion?

Written response

1 point

In the complete example, what numeric value does total have after the ten-percent discount is applied?