C++ PRELIM EXAM

Suppose x is 5 and y is 7. Choose the value of the following expression:

(x != 7) && (x <= y)

• false

• 1

• 0

• null

Suppose that x is an int variable. Which of the following expressions always evaluates to true?

• (x > 0) || ( x <= 0)

• (x >= 0) || (x == 0)

• (x > 0) && ( x <= 0)

• (x > 0) && (x == 0)

Which of the following expressions correctly determines that x is greater than 10 and less than 20?

• 10 < x < 20

• (10 < x < 20)

• 10 < x && x < 20

• 10 < x || x < 20

The expression in an if statement is sometimes called a(n) ____.

• selection statement

• action statement

• decision maker

• action maker

What is the output of the following C++ code?

int x = 35;

int y = 45;

int z;

if (x > y)

z = x + y;

else

z = y – x;

cout << x << " " << y << " " << z << endl;

• 35 45 80

• 35 45 10

• 35 45 –10

• 35 45 0

When one control statement is located within another, it is said to be ____.

• blocked

• compound

• nested

• closed

Which of the following will cause a logical error if you are attempting to compare x to 5?

• if (x == 5)

• if (x = 5)

• if (x <= 5)

• if (x >= 5)

Assume you have three int variables: x = 2, y = 6, and z.

Choose the value of z in the following expression: z = (y / x > 0) ? x : y;.

• 2

• 3

• 4

• 6

What is the value of x after the following statements execute?

int x;

x = (5 <= 3 && 'A' < 'F') ? 3 : 4

• 2

• 3

• 4

• 5

Which of the following refers to a temporary storage that can be assigned a value within a program?

• value

• data type

• function

• variable