Question 1

A file must be ________ before data can be written to or read from it.A)closedB)openedC)bufferedD)initializedE)none of these

Accepted Answer

B)opened

Question 2

A for statement contains three expressions: initialization, test, and:A)updateB)reversalC)nullD)validationE)none of these

Accepted Answer

A)update

Question 3

A loop that is inside another loop is called:A)an infinite loopB)a pre-test loopC)a post-test loopD)a nested loopE)none of these

Accepted Answer

a nested loop

Question 4

Assuming outFile is a file stream object and number is a variable, which statement writes the contents of number to the file associated with outFile? A)write (outFile, number);B)outFile >> number;C)outFile << number;D)number >> outFile;

Accepted Answer

C)outFile << number;

Question 5

How many times will the following loop display Hello?for (int i = 0; i < 20; i++) cout << Hello! <<endl;A)20B)19C)21D)an infinite number of times

Accepted Answer

A)20

Question 6

Look at the following statement.while (x++<10)Which operator is used first?A)++B)<C)Neither. The expression is invalid

Accepted Answer

B)<

Question 7

In a for statement, this expression is executed only once. A)testB)nullC)initializationD)validationE)none of these

Accepted Answer

C)initialization

Question 8

If you want a user to enter exactly 20 values, which loop would be the best to use?A)do-whileB)forC)whileD)infiniteE)none of these

Accepted Answer

B)for

Question 9

How many times will the following loop display Hello?for (int i = 0; i <= 20; i++) cout << Hello! <<endl;A)20B)19C)21D)an infinite number of times

Accepted Answer

C)21

Question 10

The scope of a variable declared in a for loop's initialization expression always extends beyond the body of the loop.TrueFalse

Accepted Answer

False

Question 11

The do-while loop is considered a(n) ________ loop.A)pre-testB)post-testC)infiniteD)limitedE)none of these

Accepted Answer

B)post-test

Question 12

The while loop has two important parts: an expression that is tested for a true or false value, and:A)a statement or block that is repeated as long as the expression is true B)a statement or block that is repeated only if the expression is false C)one line of code that is repeated once, if the expression is true D)a statement or block that is repeated once, if the expression is true

Accepted Answer

A)a statement or block that is repeated as long as the expression is true

Question 13

This loop is a good choice when you know how many times you want the loop to iterate in advance of entering the loop.A)do-whileB)whileC)forD)infiniteE)none of these

Accepted Answer

C)for

Question 14

This statement causes a loop to terminate early.A)stop B)break C)null D)terminate E)none of these

Accepted Answer

B)break

Question 15

This statement may be used to stop a loop's current iteration and begin the next one.A)breakB)terminate C)re-iterate D)continue E)None of these

Accepted Answer

D)continue

Question 16

What is the output of the following code segment?n = 1;for (; n <= 5;) cout << n << ' '; n++;A)1 2 3 4 5B)1 1 1 ... and on foreverC)2 3 4 5 6D)1 2 3 4E)2 3 4 5

Accepted Answer

B)1 1 1 ... and on forever

Question 17

What will the following code display?int x = 0;for (int count = 0; count < 3; count ++) x + =count;cout << x <<endl;A)0  1 2 3B)0C)6D)3

Accepted Answer

D)3

Question 18

What will the following loop display?int x = 0;while (x < 5){ cout << x << endl; x++;}A)0 1 2 3 4 5B)0 1 2 3 4C)0 1 2 3 4D)The loop will display numbers starting at 0, for infinity.

Accepted Answer

B)0 1 2 3 4

Question 19

You may nest while and do-while loops, but you may not nest for loops.TrueFalse

Accepted Answer

False

Question 20

You may not use the break and continue statements within the same set of nested loops.TrueFalse

Accepted Answer

False

Computer Science I Quiz 5

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