Question 1

For which input values will the following loop not correctly compute the maximum of the values?

Accepted Answer

A) 3 3 3 3 
B) 0 1 2 9 107 
C) 107 2 9 -3 
D) -4 -2 -10 -7 
A) 3 3 3 3 
B) 0 1 2 9 107 
C) 107 2 9 -3 
D) -4 -2 -10 -7 D

Question 2

How many times does the following code fragment display "Hi"?

Accepted Answer

A) 9 times 
B) 10 times 
C) 11 times 
D) 12 times 
A) 9 times 
B) 10 times 
C) 11 times 
D) 12 times C

Question 3

The code snippet below checks whether a given number is a prime number.What will be the result of executing it?

Accepted Answer

A) The code snippet will not compile. 
B) The code snippet will display the desired result. 
C) The code snippet will display an incorrect result if the number is 1. 
D) The code snippet will loop forever. 
A) The code snippet will not compile. 
B) The code snippet will display the desired result. 
C) The code snippet will display an incorrect result if the number is 1. 
D) The code snippet will loop forever. B

Question 4

Which of the following statements expresses why the following code is considered bad form?
for (rate = 5; years-- > 0; System.out.println(balance))
...
I.unrelated expressions in loop header
II.doesn't match expected for loop idiom
III.loop iteration is not clear

Accepted Answer

A) II and III only 
B) I and II only 
C) I and III only 
D) I, II, and III 
A) II and III only 
B) I and II only 
C) I and III only 
D) I, II, and III

Question 5

How many times does the following loop execute?

Accepted Answer

A) 1 time 
B) 2 times 
C) 3 times 
D) 4 times 
A) 1 time 
B) 2 times 
C) 3 times 
D) 4 times

Question 6

Which of the following loops will print the odd numbers between 0 and 20?

Accepted Answer

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

Question 7

The for loop header can contain multiple variables of the same type and multiple update expressions, separated by commas:

for (int i = 0; j = 3; i <= 5; i++, j--)
Which loop below correctly implements the same loop using a single counter in the loop control?

Accepted Answer

A)  int i=0;
for (int j=3 ; j<=5 ; j++ )
{
i++;
} 
B)  Int i=3;
for (int j=0 ; j<=5 ; j++ )
{
i++;
} 
C)  int j=3;
for (int i=0 ; i<=5 ; j--)
{
i++;
} 
D)  Int j=3;
for (int i=0 ; i<=5 ; i++)
{
. . .
j--;
} 
A)  int i=0;
for (int j=3 ; j<=5 ; j++ )
{
i++;
} 
B)  Int i=3;
for (int j=0 ; j<=5 ; j++ )
{
i++;
} 
C)  int j=3;
for (int i=0 ; i<=5 ; j--)
{
i++;
} 
D)  Int j=3;
for (int i=0 ; i<=5 ; i++)
{
. . .
j--;
}

Question 8

How many times does the following loop execute?

Accepted Answer

A) 0 times 
B) 1 time 
C) 10 times 
D) an infinite number of times 
A) 0 times 
B) 1 time 
C) 10 times 
D) an infinite number of times

Question 9

Which of the following loop(s) could possibly not enter the loop body at all?
I.the for loop
II.the while loop
III.the do loop

Accepted Answer

A) I only 
B) I and II only 
C) II and III only 
D) I and III only 
A) I only 
B) I and II only 
C) II and III only 
D) I and III only

Question 10

What will be the result of running the following code fragment?

Accepted Answer

A) The code fragment will display the interest calculated for nine years. 
B) The code fragment will continue to display the calculated interest forever because the loop will never end. 
C) The code fragment will not display the calculated interest and halt abruptly. 
D) The code fragment will not display any output because it will not compile. 
A) The code fragment will display the interest calculated for nine years. 
B) The code fragment will continue to display the calculated interest forever because the loop will never end. 
C) The code fragment will not display the calculated interest and halt abruptly. 
D) The code fragment will not display any output because it will not compile.

Question 11

What does the following loop compute?

Accepted Answer

A) the average of all the integers in the input 
B) the sum of all the positive integers in the input divided by the number of integers in the input 
C) the average of all the positive integers in the input 
D) the second smallest value in the input 
A) the average of all the integers in the input 
B) the sum of all the positive integers in the input divided by the number of integers in the input 
C) the average of all the positive integers in the input 
D) the second smallest value in the input

Question 12

What is the output of the following code snippet?

Accepted Answer

A)  0 1 5 7 9 11 13 15 17 19 
B)  0 1 1 2 3 5 8 13 21 34 55 
C)  0 1 4 6 8 10 12 14 16 18 
D)  0 1 6 7 9 12 14 17 19 21 
A)  0 1 5 7 9 11 13 15 17 19 
B)  0 1 1 2 3 5 8 13 21 34 55 
C)  0 1 4 6 8 10 12 14 16 18 
D)  0 1 6 7 9 12 14 17 19 21

Question 13

What is the output of the code below?

Accepted Answer

A) +0+00+000+0000 
B) +000+000+000+000 
C) ++0+00+000 
D) ++++000000 
A) +0+00+000+0000 
B) +000+000+000+000 
C) ++0+00+000 
D) ++++000000

Question 14

What is the output of the code snippet given below?

Accepted Answer

A) No output 
B) 0 3 6 9 12 15 18 
C) 0 1 3 5 7 9 
D) 0 3 6 9 ….(infinite loop) 
A) No output 
B) 0 3 6 9 12 15 18 
C) 0 1 3 5 7 9 
D) 0 3 6 9 ….(infinite loop)

Question 15

What output does this while loop generate?

Accepted Answer

A) No output is generated. 
B) 6, 5, 4, 3, 2, 1 
C) 6, 5, 4, 3, 2, 1, 
D) The output is infinite. 
A) No output is generated. 
B) 6, 5, 4, 3, 2, 1 
C) 6, 5, 4, 3, 2, 1, 
D) The output is infinite.

Question 16

What does the method below return?

Accepted Answer

A) the position of the first 'e' in the string or the length of the string if there is no 'e' 
B) the position of the last 'e' in the string or the length of the string if there is no 'e' 
C) the position of the first character that is not an 'e' in the string or the length of the string if there is no character that is not an 'e' 
D) the position of the last character that is not an 'e' in the string or the length of the string if there is no character that is not an 'e' 
A) the position of the first 'e' in the string or the length of the string if there is no 'e' 
B) the position of the last 'e' in the string or the length of the string if there is no 'e' 
C) the position of the first character that is not an 'e' in the string or the length of the string if there is no character that is not an 'e' 
D) the position of the last character that is not an 'e' in the string or the length of the string if there is no character that is not an 'e'

Question 17

What changes do you need to make in the following code snippet to display "Let us learn Java" exactly 10 times?

Accepted Answer

A) while (i < 9) 
B) while (i < 11) 
C) while (i < 12) 
D) int i = 1; 
A) while (i < 9) 
B) while (i < 11) 
C) while (i < 12) 
D) int i = 1;

Question 18

What is the last output line of the code snippet given below?

Accepted Answer

A) no output 
B) 1**2 
C) 1**2**3 
D) 1** 
A) no output 
B) 1**2 
C) 1**2**3 
D) 1**

Question 19

What will be printed by the statements below?

Accepted Answer

A) 10 9 8 7 6 5 
B) 10 9 8 7 6 
C) 5 6 7 8 9 10 
D) 6 7 8 9 10 
A) 10 9 8 7 6 5 
B) 10 9 8 7 6 
C) 5 6 7 8 9 10 
D) 6 7 8 9 10

Question 20

Assuming the variable n is an integer that stores a positive value, which of the following is a loop with a bound that could be problematic?

Accepted Answer

A) for (i = 1; i != n; i++) 
B) for (years = n; years < 0; years--) 
C) for (i = 1; i <= n; i++) 
D) for (int i = 1; i <= 10; i++) 
A) for (i = 1; i != n; i++) 
B) for (years = n; years < 0; years--) 
C) for (i = 1; i <= n; i++) 
D) for (int i = 1; i <= 10; i++)

Exam 6: Loops

For which input values will the following loop not correctly compute the maximum of the values?

How many times does the following code fragment display "Hi"?

The code snippet below checks whether a given number is a prime number.What will be the result of executing it?

Which of the following statements expresses why the following code is considered bad form? for (rate = 5; years-- > 0; System.out.println(balance)) ... I.unrelated expressions in loop header II.doesn't match expected for loop idiom III.loop iteration is not clear

How many times does the following loop execute?

Which of the following loops will print the odd numbers between 0 and 20?

The for loop header can contain multiple variables of the same type and multiple update expressions, separated by commas: for (int i = 0; j = 3; i <= 5; i++, j--) Which loop below correctly implements the same loop using a single counter in the loop control?

How many times does the following loop execute?

Which of the following loop(s) could possibly not enter the loop body at all? I.the for loop II.the while loop III.the do loop

What will be the result of running the following code fragment?

What does the following loop compute?

What is the output of the following code snippet?

What is the output of the code below?

What is the output of the code snippet given below?

What output does this while loop generate?

What does the method below return?

What changes do you need to make in the following code snippet to display "Let us learn Java" exactly 10 times?

What is the last output line of the code snippet given below?

What will be printed by the statements below?

Assuming the variable n is an integer that stores a positive value, which of the following is a loop with a bound that could be problematic?

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