Question 1

What will be the output of the following code snippet?
Boolean token = false;
Do
{
System.out.println("Hello");
}
While (token);
A) "Hello" will be displayed infinite times.
B) No output because of compilation error.
C) No output after successful compilation.
D) "Hello" will be displayed only once.

Accepted Answer

The do-while loop executes the block of code once before checking the condition. Since the condition is false, "Hello" will be printed only once.

Question 2

What is the output of the code snippet given below?
String s = "12345";
Int i = 1;
Do
{
If (i > 1)
{
System.out.print);
}
}
While (i < 5);
A) No output
B) No output (infinite loop)
C) 12345
D) 2345

Accepted Answer

The given code will result in an infinite loop because the value of 'i' is not incremented inside the loop, and the condition 'i < 5' will always remain true. Also, there is a syntax error in the line 'System.out.print)' where the closing parenthesis is missing for the print statement, which will give a compilation error. Therefore, there will be no output, but the loop will run infinitely.

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

Question 4

What is the result when the following code is run?
Double x = 1;
Double y = 1;
Int i = 0;
Do
{
Y = x / 2;
X = x + y;
I = i + 1;
}
While (x < 2.5);
System.out.print(i + " ");
A) 1
B) 2
C) 3
D) 4

Accepted Answer

The code creates two variables, x and y, both with initial value of 1, and an integer variable i with initial value of 0. It then enters a do-while loop, where y is assigned the value of x divided by 2, x is assigned the value of x plus y, and i is incremented by 1. The loop condition checks if x is less than 2.5. Since the initial value of x is 1, the loop will run as long as x is less than 2.5.

The first iteration of the loop will result in x being assigned the value of 1.5 and i being assigned the value of 1. In the second iteration, x will be assigned the value of 2.25 and i will be assigned the value of 2. In the third iteration, x will be assigned the value of 3.375 and i will be assigned the value of 3. Since x is now greater than 2.5, the loop will terminate.

After the loop, the code prints the value of i, which is 3. Therefore, the correct answer is C.

Question 5

Which of the following is the correct code snippet for throwing a pair of dice to get a sum of the numbers on two dice between 2 and 12 with different probabilities?
A) (int) (Math.random() * 6 + 1)
B) (int) (Math.random() * 12 + 1)
C) (int) (Math.random() * 6 + 1) + (int) (Math.random() * 6 + 1)
D) (int) (Math.random() * 12 - 2)

Accepted Answer

This code snippet generates a random number between 1 and 6 for each dice using (int) (Math.random() * 6 + 1) and adds them together to get a sum between 2 and 12. Since each dice has an equal probability of landing on any number between 1 and 6, this code snippet generates different probabilities for each sum.

Question 6

What is the output of the following code snippet?
Int i = 1;
While (i <= 10)
{
System.out.println("Inside the while loop");
I = i + 10;
}
A) No output because of compilation error.
B) "Inside the while loop" will be displayed 10 times.
C) No output after successful compilation.
D) "Inside the while loop" will be displayed only once.

Accepted Answer

The code will initially set i to 1 and then enter the while loop. The statement inside the loop will be executed once and i will be incremented to 11. Since i is now greater than 10, the loop will not execute again and the program will end with only one output of "Inside the while loop".

Question 7

Given the following code snippet, what should we change to have 26 alphabet characters in the string str?
String str = "";
For (char c = 'A'; c < 'Z'; c++)
{
Str = str + c;
}
A) int c = 'A'
B) str = c + str;
C) c <= 'Z'
D) Must change to use a do loop

Accepted Answer

Currently the loop only runs until c is less than 'Z', so the last character 'Z' is not included in the string. Changing the condition to c <= 'Z' would include all 26 alphabet characters.

Question 8

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

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

Question 9

What will be the range of the random numbers generated by the following code snippet?
Int r1 = (int) (Math.random() * 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 code generates a random double between 0.0 (inclusive) and 1.0 (exclusive) using the Math.random() method. Then, it multiplies the random double by 50, which gives a range of 0.0 to 49.9999. Next, it casts this result into an integer, which truncates the decimal part and leaves an integer between 0 and 49. Finally, it adds 1 to the result, giving a range of 1 to 50. Therefore, the answer is D: Between 1 and 50.

Question 10

What is the output of the following code snippet?
Int i = 1;
While (i < 20)
{
System.out.print(i + " ");
I = i + 2;
If (i == 15)
{
I = 19;
}
}
A) 1 3 5 7 9 11 13 15 17 19
B) 1 3 5 7 9 11 13 19
C) 1 3 5 7 9 11 13 15 17
D) 1 3 5 7 9 11 13 17 19

Accepted Answer

The code starts with integer variable i being initialized to 1. The while loop checks if i is less than 20, and executes the block of code within the loop if the condition is true. 
Within the block, the current value of i is printed with a space (e.g. "1 "), and then i is incremented by 2. 
If i equals 15, then i is set to 19 before continuing with the next iteration of the loop. 
Therefore, the output of the code will be: 
1 3 5 7 9 11 13 19

Question 11

What is the output of the code fragment given below?
Int i = 0;
Int j = 0;
While (i < 125)
{
I = i + 2;
J++;
}
System.out.println(j);
A) 0
B) 62
C) 63
D) The code fragment displays no output because it does not compile.

Accepted Answer

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

Question 12

What is the data type of the number generated by the Math.random() function?
A) double
B) float
C) int
D) String

Accepted Answer

The Math.random() function generates a pseudorandom double value between 0.0 and 1.0 (inclusive), so the data type of the number generated is a double.

Question 13

What is the output of the code snippet given below?
String s = "abcde";
Int i = 1;
Do
{
If (i > 1)
{
System.out.print);
}
}
While (i < 5);
A) No output
B) No output (infinite loop)
C) abcde
D) bcde

Accepted Answer

The code contains an infinite loop because the variable i is initialized as 1 and is never updated inside the loop. Therefore, the condition `while(i < 5)` will always be true, causing the loop to run indefinitely. Also, there's a syntax error in the code as there is an extra closing parenthesis in the `System.out.print` statement.

Question 14

What is the output of the code snippet given below?
String s = "abcde";
Int i = 1;
While (i < 5)
{
System.out.print);
I++;
}
A) No output
B) abcd
C) abcde
D) bcde

Accepted Answer

The code will iterate through the while loop four times, printing out one letter each time. The variable "i" starts at 1 and ends at 4, so the letters that will be printed are b, c, d, and e. Therefore, the output will be "bcde".

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");
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

The answer of In the following code snippet, when does...

Question 16

What will be the final output of the following code snippet when a user enters input values in the order 10, 20, 30, 40, 50, and -1?
Public static void main(String[] args)
{
Double sum = 0;
Int count = 0;
Double salary = 0;
Double average = 0;
Scanner reader = new Scanner(System.in);
System.out.println("Enter salaries (-1 to stop): ");
While (salary != -1)
{
Salary = reader.nextInt();
If (salary != -1)
{
Sum = sum + salary;
Count++;
}
}
If (count > 0)
{
Average = sum / count;
System.out.println("The Average Salary: " + average);
}
Else
{
System.out.println ("No data!");
}
Return 0;
}
A) The Average Salary: 0
B) The Average Salary: 30
C) The Average Salary: 24.83333
D) There will be no output as the code snippet will not compile.

Accepted Answer

The answer of What will be the final output of...

Question 17

What is the output of the code snippet given below?
String s = "12345";
Int i = 1;
While (i < 5)
{
System.out.print);
I++;
}
A) No output
B) 1234
C) 12345
D) 2345

Accepted Answer

The loop runs until the condition i<5 is true. Initially, the value of i is 1. Therefore, the loop will run for four iterations (i=1,2,3,4) and print the characters at index 1, 2, 3, and 4 of the string "12345". The output will be "2345".

Question 18

What will be the output of the following code snippet?
Boolean token = false;
While (token)
{
System.out.println("Hello");
}
A) "Hello" will be displayed infinite times.
B) No output because of compilation error.
C) No output after successful compilation.
D) "Hello" will be displayed only once.

Accepted Answer

The loop will not execute as the boolean variable token is initialized to false, and the condition in the while loop is to execute the loop only if token is true. Therefore, there will be no output after successful compilation.

Question 19

How many times does the code snippet below display "Hello"?
Int i = 0;
While (i != 15)
{
System.out.println("Hello");
I++;
}
A) Infinite times
B) 14 times
C) 15 times
D) 16 times

Accepted Answer

The code snippet initializes the variable "i" to 0 and uses a while loop to print "Hello" to the console as long as "i" is not equal to 15. After each iteration, the value of "i" is incremented by 1.

Therefore, the loop will run 15 times (0 through 14) and display "Hello" 15 times before terminating.

Therefore, the correct answer is C.

Question 20

What is the outcome of the following code snippet?
Boolean val1 = true;
Boolean val2 = false;
While (val1)
{
If (val1)
{
System.out.println("Hello");
}
Val1 = val2;
}
A) No output will be displayed because of compilation error.
B) "Hello" will be displayed only once.
C) "Hello" will be displayed infinite times.
D) No output will be displayed even after successful compilation of the code snippet.

Accepted Answer

The code will print "Hello" once because the while loop runs as long as val1 is true. Inside the loop, "Hello" is printed, and then val1 is set to val2 (false), causing the loop to terminate.

Quiz 4: Loops

What will be the output of the following code snippet? Boolean token = false; Do { System.out.println("Hello") ; } While (token) ;

What is the output of the code snippet given below? String s = "12345"; Int i = 1; Do { If (i > 1) { System.out.print) ; } } While (i < 5) ;

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 result when the following code is run? Double x = 1; Double y = 1; Int i = 0; Do { Y = x / 2; X = x + y; I = i + 1; } While (x < 2.5) ; System.out.print(i + " ") ;

Which of the following is the correct code snippet for throwing a pair of dice to get a sum of the numbers on two dice between 2 and 12 with different probabilities?

What is the output of the following code snippet? Int i = 1; While (i <= 10) { System.out.println("Inside the while loop") ; I = i + 10; }

Given the following code snippet, what should we change to have 26 alphabet characters in the string str? String str = ""; For (char c = 'A'; c < 'Z'; c++) { Str = str + c; }

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

What will be the range of the random numbers generated by the following code snippet? Int r1 = (int) (Math.random() * 50) + 1;

What is the output of the following code snippet? Int i = 1; While (i < 20) { System.out.print(i + " ") ; I = i + 2; If (i == 15) { I = 19; } }

What is the output of the code fragment given below? Int i = 0; Int j = 0; While (i < 125) { I = i + 2; J++; } System.out.println(j) ;

What is the data type of the number generated by the Math.random() function?

What is the output of the code snippet given below? String s = "abcde"; Int i = 1; Do { If (i > 1) { System.out.print) ; } } While (i < 5) ;

What is the output of the code snippet given below? String s = "abcde"; Int i = 1; While (i < 5) { System.out.print) ; I++; }

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 the code snippet given below? String s = "12345"; Int i = 1; While (i < 5) { System.out.print) ; I++; }

What will be the output of the following code snippet? Boolean token = false; While (token) { System.out.println("Hello") ; }

How many times does the code snippet below display "Hello"? Int i = 0; While (i != 15) { System.out.println("Hello") ; I++; }

What is the outcome of the following code snippet? Boolean val1 = true; Boolean val2 = false; While (val1) { If (val1) { System.out.println("Hello") ; } Val1 = val2; }