Question 1

In the following code snippet, when does the execution of the program switch from the inner loop to the outer loop?
Int i;
Int j;
For (i = 0; i <= 9; i++)
{
For (j = 1; j < 5; j++)
{
System.out.println("Hello");
If (j == 2)
{
J = 6;
}
}
}
A) When the value of j becomes 6
B) When the program executes completely
C) When the condition for the outer loop is met
D) When the value of i is incremented

Accepted Answer

When `j` is set to 6, the condition `j < 5` becomes false, causing the inner loop to terminate and control to return to the outer loop.

Question 2

What is the output of this loop?
Int i = 0;
Boolean found;
While (i < 20 && !found)
{
Int sum = i * 2 + i * 3;
System.out.print(sum + " ");
If (sum > 50)
{
Found = true;
}
I++;
}
A) 0 5 10 15 20 25 30 35 40 45 50 55
B) 0
C) No output, compilation error
D) 0 5 10

Accepted Answer

The code will not compile due to the incorrect capitalization of the Boolean variable "found" and the "if" statement.

Question 3

How many times does the following loop execute?
Int upperCaseLetters = 0;
String str = "abcdEfghI";
Boolean found = false;
For (int i = 0; i < str.length() && !found; i++)
{
Char ch = str.charAt(i);
If (Character.isUpperCase(ch))
{
Found = true;
}
}
A) 9 times
B) 8 times
C) 5 times
D) 1 time

Accepted Answer

The loop executes 5 times because it stops when it finds the first uppercase letter 'E' at index 4.

Question 4

Which of the following conditions can be added to the code below so it will loop until the user enters "no" or "NO"? Scanner in = new Scanner (System.in);
System.out.print ("Continue? ");
String response = in.next();
While (/* put condition here */)
{
System.out.println ("Hello beautiful!");
System.out.print ("Continue? ");
Response = in.next();
}
A)response.equals("no") != response.equals("NO")
B)!(response.equals("no") || response.equals("NO"))
C)!response.equals("no") || !response.equals("NO")
D)!(response.equals("no") && response.equals("NO"))

Accepted Answer

The answer of Which of the following conditions can be...

Question 5

What is the first and last value of i to be displayed by the following code snippet?
Int n = 20;
For (int i = 0; i <= n; i++)
{
For (int j = 0; j <= i; j++)
{
System.out.println("" + i);
}
}
A) 0 and 20
B) 1 and 20
C) 0 and 19
D) 1 and 19

Accepted Answer

The outer loop starts with i = 0 and goes up to i = 20, inclusive. Therefore, the first value of i displayed is 0 and the last value is 20.

Question 6

How many times does the following loop execute?
Int i = 0;
Boolean found = false;
While (i < 100 && !found)
{
I++;
System.out.print(i + " ");
Int j = i * i;
If ((i * i * i) % j == j)
{
Found = true;
}
}
A) 10 times
B) 20 times
C) 100 times
D) An infinite number of times

Accepted Answer

The answer of How many times does the following loop...

Question 7

For which input values will the following loop not correctly compute the maximum of the values? Scanner in = new Scanner (System.in);
Int max = 0;
While (in.hasNextInt())
{
Int value = in.nextInt();
If (value > max)
{
Max = value;
}
}
A)3 3 3 3
B)0 1 2 9 107
C)107 2 9 -3
D)-4 -2 -10 -7

Accepted Answer

The answer of For which input values will the following...

Question 8

Which of the following loops will print the odd numbers between 0 and 20?
A)for (int num = 1; num < 20; num++) {
System.out.print (num % 2 + " ");
}
B)for (int num = 0; num < 20; num+= 2) {
System.out.print (num + " ");
}
C)for (int num = 1; num < 20; num+= 2) {
System.out.print (num + " ");
}
D)for (int num = 0; num < 20; num+= 2) {
If (num % 2 == 1)
System.out.print (num + " ");
}

Accepted Answer

The loop in option C starts at 1 and increments by 2, printing all odd numbers between 1 and 19.

Question 9

Which code snippet produces the sum of the first n even numbers?
A) int sum = 0;
For (int i = 1; i <= n; i++)
{
If (i % 2 == 0)
{
Sum = sum + i;
}
}
B) int sum = 0;
For (int i = 1; i <= n; i++)
{
Sum = sum + i * 2;
}
C) int sum = 0;
For (int i = 0; i < n; i++)
{
If (i % 2 == 0)
{
Sum = sum + i;
}
}
D) int sum;
For (int i = 1; i <= n; i++)
{
Sum = sum + i * 2;

Accepted Answer

The code snippet in option B correctly calculates the sum of the first n even numbers by adding 2 times each integer from 1 to n.

Question 10

Which statement about storyboards is true?
A) A storyboard can help prevent potential user confusion early in the design process.
B) Storyboards are used primarily to understand how implemented programs work.
C) The storyboard helps to train users about how to use software.
D) Storyboards have no relationship to the structure of an actual working program.

Accepted Answer

Storyboards are used as a visual representation of the flow and interactions of a software or application. By creating a storyboard, designers can identify and prevent potential user confusion early in the design process, ensuring a better user experience. Thus, option A is the correct statement. Option B is incorrect because storyboards are not used primarily to understand how implemented programs work. Option C is also incorrect because the storyboard is not a training tool but a design tool. Option D is incorrect because storyboards have a direct relationship to the structure of the actual working program.

Question 11

Suppose you must design a program to calculate the roll-out (number of inches traveled in one revolution of the pedals of a bicycle based on its gear combinations). The user must provide the gear sizes, which must be converted into roll-out for all different gear combinations. How can the flow of user interaction for this problem be designed?
A) Hand-tracing can confirm code that implements gear selection.
B) Pseudocode can guide algorithm design through divide-and-conquer strategy.
C) A storyboard can be used.
D) The physical gears can lead to ideas for the correct algorithm to use.

Accepted Answer

A storyboard can be used to visually map out the user interaction flow, helping to design the sequence of inputs and outputs for calculating the roll-out based on gear combinations.

Question 12

Which of the following activities can be simulated using a computer?
I. Waiting time in a line at a restaurant
II. Tossing a coin
III. Shuffling cards for a card game
A) I only
B) II only
C) I and II only
D) I, II, and III

Accepted Answer

All three activities can be simulated using a computer. Computers can model waiting times using queuing theory, simulate coin tosses using random number generation, and shuffle cards by randomly rearranging a list.

Question 13

A loop inside another loop is called:
A) A sentinel loop
B) A nested loop
C) A parallel loop
D) A do/while loop

Accepted Answer

A loop inside another loop is called a nested loop.

Question 14

What will be the range of the random numbers generated by the following code snippet? Random generator = new Random();
Int r1 = generator.nextInt(50) + 1;
A) Between 1 and 49
B) Between 0 and 50
C) Between 0 and 49
D) Between 1 and 50

Accepted Answer

The `nextInt(50)` generates numbers from 0 to 49, and adding 1 shifts the range to 1 to 50.

Question 15

In the following code snippet, when does the execution of the program switch from the inner loop to the outer loop?
Int i;
Int j;
For (i = 0; i <= 9; i++)
{
For (j = 1; j < 5; j++)
{
System.out.println("Hello");
}
}
A) When the value of j becomes 5
B) When the program executes completely
C) When the condition for the outer loop is met
D) When the value of i is incremented

Accepted Answer

The execution switches from the inner loop to the outer loop when the value of j becomes 5, as the inner loop condition `j < 5` is no longer satisfied.

Question 16

Which for loop prints data across each row in the following code snippet?
Int i;
Int j;
For (i = 1; i <= 3; i++)
{
For (j = 1; j <= 3; j++)
{
System.out.print("X");
}
System.out.println("");
}
A) The inner for loop
B) The outer for loop
C) Both for loops
D) Another missing for loop

Accepted Answer

The inner for loop prints "X" across each row, while the outer for loop moves to the next line after each row is printed.

Question 17

How many times will the output line be printed in the following code snippet? for (int num2 = 1; num2 <= 3; num2++)
{
For (int num1 = 0; num1 <= 2; num1++)
{
System.out.println("" + num2 + " " + num1);
}
}
A) 3 times
B) 6 times
C) 9 times
D) 12 times

Accepted Answer

The outer loop runs 3 times (for num2 = 1, 2, 3) and the inner loop runs 3 times for each iteration of the outer loop (for num1 = 0, 1, 2), resulting in 3 * 3 = 9 total iterations.

Question 18

What will be the output of the following code snippet?
Int i;
Int j;
For (i = 0; i < 7; i++)
{
For (j = 7; j > i; j--)
{
System.out.print("*");
}
System.out.println("");
}
A) A rectangle with six rows and seven columns of asterisks. The number of rows increments by one on completion of one iteration of the inner loop.
B) A right triangle with six rows and seven columns of asterisks. The number of columns increments by one on completion of one iteration of the inner loop.
C) A rectangle with seven rows and six columns of asterisks. The number of rows increments by one on completion of one iteration of the inner loop.
D) A right triangle with six rows and seven columns of asterisks. The number of columns decrements by one on completion of one iteration of the inner loop.

Accepted Answer

The outer loop runs 7 times, and the inner loop starts at 7 and decrements until it is greater than the current value of 'i'. This creates a right triangle pattern where the number of asterisks decreases by one in each subsequent row.

Question 19

What is the last output line of the code snippet given below?
Int i = 0;
While (i < 10)
{
Int num = 1;
For (int j = i; j > 1; j--)
{
System.out.print(j + " ");
Num = num * 2;
}
System.out.println("***");
I++;
}
A) 3 2 ***
B) 9 8 7 6 5 4 3 2 ***
C) 8 7 6 5 4 3 2 ***
D) 2 ***

Accepted Answer

The loop runs until i is 9, and for i = 9, the inner loop prints numbers from 9 down to 2, followed by "***".

Question 20

What is the output of this code snippet if the user enters the numbers 1 2 3 4 -1 5? double total = 0;
Boolean hasValidNumber = true;
Scanner in = new Scanner(System.in);
While (in.hasNextDouble() && hasValidNumber)
{
Double input = in.nextDouble();
If (input < 0)
{
HasValidNumber = false;
}
Else
{
Total = total + input;
}
}
System.out.println(total);
A) 15.0
B) 14.0
C) 12.0
D) 10.0

Accepted Answer

The answer of What is the output of this code...

Quiz 6: Loops

In the following code snippet, when does the execution of the program switch from the inner loop to the outer loop? Int i; Int j; For (i = 0; i <= 9; i++) { For (j = 1; j < 5; j++) { System.out.println("Hello") ; If (j == 2) { J = 6; } } }

What is the output of this loop? Int i = 0; Boolean found; While (i < 20 && !found) { Int sum = i * 2 + i * 3; System.out.print(sum + " ") ; If (sum > 50) { Found = true; } I++; }

How many times does the following loop execute? Int upperCaseLetters = 0; String str = "abcdEfghI"; Boolean found = false; For (int i = 0; i < str.length() && !found; i++) { Char ch = str.charAt(i) ; If (Character.isUpperCase(ch) ) { Found = true; } }

What is the first and last value of i to be displayed by the following code snippet? Int n = 20; For (int i = 0; i <= n; i++) { For (int j = 0; j <= i; j++) { System.out.println("" + i) ; } }

How many times does the following loop execute? Int i = 0; Boolean found = false; While (i < 100 && !found) { I++; System.out.print(i + " ") ; Int j = i * i; If ((i * i * i) % j == j) { Found = true; } }

For which input values will the following loop not correctly compute the maximum of the values? Scanner in = new Scanner (System.in) ; Int max = 0; While (in.hasNextInt() ) { Int value = in.nextInt() ; If (value > max) { Max = value; } }

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

Which code snippet produces the sum of the first n even numbers?

Which statement about storyboards is true?

Which of the following activities can be simulated using a computer? I. Waiting time in a line at a restaurant II. Tossing a coin III. Shuffling cards for a card game

A loop inside another loop is called:

What will be the range of the random numbers generated by the following code snippet? Random generator = new Random() ; Int r1 = generator.nextInt(50) + 1;

In the following code snippet, when does the execution of the program switch from the inner loop to the outer loop? Int i; Int j; For (i = 0; i <= 9; i++) { For (j = 1; j < 5; j++) { System.out.println("Hello") ; } }

Which for loop prints data across each row in the following code snippet? Int i; Int j; For (i = 1; i <= 3; i++) { For (j = 1; j <= 3; j++) { System.out.print("X") ; } System.out.println("") ; }

How many times will the output line be printed in the following code snippet? for (int num2 = 1; num2 <= 3; num2++) { For (int num1 = 0; num1 <= 2; num1++) { System.out.println("" + num2 + " " + num1) ; } }

What will be the output of the following code snippet? Int i; Int j; For (i = 0; i < 7; i++) { For (j = 7; j > i; j--) { System.out.print("*") ; } System.out.println("") ; }

What is the last output line of the code snippet given below? Int i = 0; While (i < 10) { Int num = 1; For (int j = i; j > 1; j--) { System.out.print(j + " ") ; Num = num * 2; } System.out.println("***") ; I++; }