Question 1

Which of the following loops executes 8 times?

Accepted Answer

A) for (years = 8; years >= 0; years--) 
B) for(i = 0; i = 11; i--) 
A) for (years = 8; years >= 0; years--) 
B) for(i = 0; i = 11; i--)

Question 2

How do you fix this code snippet to make it print out the sum when the user enters a letter rather than a double? The user must enter at least one double when the program begins.

Accepted Answer

A) while (in.hasData()); 
B) while (!in.hasEnded()); 
C) while (in.hasNextDouble()); 
D) while (hasData); 
A) while (in.hasData()); 
B) while (!in.hasEnded()); 
C) while (in.hasNextDouble()); 
D) while (hasData);

Question 3

What is the best strategy for avoiding off-by-one errors?

Accepted Answer

A) Randomly insert +1 or -1 until the program seems to work. 
B) Think through a couple of test cases and use the results to come up with a rationale for decisions. 
C) Always start a loop at 0. 
D) Never use the < operator by itself in a comparison test. 
A) Randomly insert +1 or -1 until the program seems to work. 
B) Think through a couple of test cases and use the results to come up with a rationale for decisions. 
C) Always start a loop at 0. 
D) Never use the < operator by itself in a comparison test.

Question 4

What are the values of i and j after the following code fragment runs?

Accepted Answer

A) i = 1951, j = 0 
B) i = 1951, j = 45 
C) i = 65, j = 1 
D) i = 65, j = 45 
A) i = 1951, j = 0 
B) i = 1951, j = 45 
C) i = 65, j = 1 
D) i = 65, j = 45

Question 5

What is the output of this code snippet if the user enters the numbers   ?

Accepted Answer

A) 15.0 
B) 14.0 
C) 12.0 
D) 10.0 
A) 15.0 
B) 14.0 
C) 12.0 
D) 10.0

Question 6

When hand-tracing a portion of code, which statement about Boolean conditions is true?

Accepted Answer

A) They typically are too complex to be evaluated. 
B) They do not need to be monitored because their result usually is not stored in a variable. 
C) It is rare to encounter a Boolean condition. 
D) They are crucial to evaluate since they determine if-statement conditions and looping control. 
A) They typically are too complex to be evaluated. 
B) They do not need to be monitored because their result usually is not stored in a variable. 
C) It is rare to encounter a Boolean condition. 
D) They are crucial to evaluate since they determine if-statement conditions and looping control.

Question 7

A loop inside another loop is called a

Accepted Answer

A) sentinel loop. 
B) nested loop. 
C) parallel loop. 
D) do/while loop. 
A) sentinel loop. 
B) nested loop. 
C) parallel loop. 
D) do/while loop.

Question 8

Which of the following conditions can be added to the code below so it will loop until the value of sum is greater than 100?

Accepted Answer

A) sum != 0 
B) sum  100 
D) sum == 100 
A) sum != 0 
B) sum  100 
D) sum == 100

Question 9

Suppose that a program asks a user to enter multiple integers, either positive or negative, to do some calculation.The data entry will stop when the user enters a certain value to indicate the end of the data.What value should the program use as the sentinel?

Accepted Answer

A) 0 
B) -1 
C) 999 
D) an alphabetic character 
A) 0 
B) -1 
C) 999 
D) an alphabetic character

Question 10

What is the output of the following code snippet?

Accepted Answer

A) r = 16.0 
B) r = 128.0 
C) r = 4096.0 
D) r = 65536.0 
A) r = 16.0 
B) r = 128.0 
C) r = 4096.0 
D) r = 65536.0

Question 11

What is the output of the code snippet given below?

Accepted Answer

A) no output 
B) no output (infinite loop) 
C) 12345 
D) 2345 
A) no output 
B) no output (infinite loop) 
C) 12345 
D) 2345

Question 12

What is the output of the code fragment given below?

Accepted Answer

A) j=27 
B) j=12 
C) j=13 
D) j=14 
A) j=27 
B) j=12 
C) j=13 
D) j=14

Question 13

How many times is the text "Let's have fun with Java." printed when this code snippet is run?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 10 
A) 1 
B) 2 
C) 3 
D) 10

Question 14

What will be the output of the following code snippet?

Accepted Answer

A) Hello will be displayed infinitely many times. 
B) There will be no output as the code snippet will not compile. 
C) There will be no output after successful compilation. 
D) Hello will be displayed only once. 
A) Hello will be displayed infinitely many times. 
B) There will be no output as the code snippet will not compile. 
C) There will be no output after successful compilation. 
D) Hello will be displayed only once.

Question 15

What are the values of i and j after the following code snippet is run?

Accepted Answer

A)   
B)   
C)   
D)   
A)   
B)   
C)   
D)

Question 16

In the __________ loop header, you can include multiple update expressions, separated by commas, but it is not recommended.

Accepted Answer

A) do 
B) while 
C) for 
D) if 
A) do 
B) while 
C) for 
D) if

Question 17

Which statement about this code snippet is accurate?

Accepted Answer

A) The loop will run 50 times. 
B) The loop will never stop. 
C) The loop will run at most 50 times, but may stop earlier when balance exceeds or equals targetBalance. 
D) There is a compilation error. 
A) The loop will run 50 times. 
B) The loop will never stop. 
C) The loop will run at most 50 times, but may stop earlier when balance exceeds or equals targetBalance. 
D) There is a compilation error.

Question 18

Which of the statements about hand-tracing is true?

Accepted Answer

A) You need a working program in order to do hand-tracing. 
B) Hand-tracing can be done with pseudocode. 
C) Hand-tracing will clearly show how long a program will take to execute. 
D) The goal of hand-tracing is to double check the answers of the running code. 
A) You need a working program in order to do hand-tracing. 
B) Hand-tracing can be done with pseudocode. 
C) Hand-tracing will clearly show how long a program will take to execute. 
D) The goal of hand-tracing is to double check the answers of the running code.

Question 19

What is the output of the code snippet given below?

Accepted Answer

A) abcd 
B) bcde 
C) bcbcd 
D) cdef 
A) abcd 
B) bcde 
C) bcbcd 
D) cdef

Question 20

How many times will the output line be printed in the following code snippet?

Accepted Answer

A) 3 times 
B) 6 times 
C) 9 times 
D) 12 times 
A) 3 times 
B) 6 times 
C) 9 times 
D) 12 times

Exam 6: Loops

Which of the following loops executes 8 times?

How do you fix this code snippet to make it print out the sum when the user enters a letter rather than a double? The user must enter at least one double when the program begins.

What is the best strategy for avoiding off-by-one errors?

What are the values of i and j after the following code fragment runs?

What is the output of this code snippet if the user enters the numbers ?

When hand-tracing a portion of code, which statement about Boolean conditions is true?

A loop inside another loop is called a

Which of the following conditions can be added to the code below so it will loop until the value of sum is greater than 100?

Suppose that a program asks a user to enter multiple integers, either positive or negative, to do some calculation.The data entry will stop when the user enters a certain value to indicate the end of the data.What value should the program use as the sentinel?

What is the output of the following code snippet?

What is the output of the code snippet given below?

What is the output of the code fragment given below?

How many times is the text "Let's have fun with Java." printed when this code snippet is run?

What will be the output of the following code snippet?

What are the values of i and j after the following code snippet is run?

In the __________ loop header, you can include multiple update expressions, separated by commas, but it is not recommended.

Which statement about this code snippet is accurate?

Which of the statements about hand-tracing is true?

What is the output of the code snippet given below?

How many times will the output line be printed in the following code snippet?

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