Question 1

The code snippet below checks whether a given number is a prime number. What will be the result of executing it? public static void main(String[] args)
{
Int j = 2;
Int result = 0;
Int number = 0;
Scanner reader = new Scanner(System.in);
System.out.println("Please enter a number: ");
Number = reader.nextInt();
While (j <= number / 2) // better is while (j * j <= number)
{
If (number % j == 0)
{
Result = 1;
}
J++;
}
If (result == 1)
{
System.out.println("Number: " + number + " is Not Prime.");
}
Else
{
System.out.println("Number: " + number + " is Prime. ");
}
}
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. // incorrect if number is 1
D) The code snippet will loop forever.

Accepted Answer

The code snippet will display the desired result.

Question 2

What output does this while loop generate? j = 6;
While (j > 0)
{
System.out.print(j + ", ");
J--;
}
A) No output is generated.
B) 6, 5, 4, 3, 2, 1
C) 6, 5, 4, 3, 2, 1,
D) The output is infinite.

Accepted Answer

The loop decrements 'j' from 6 to 1, printing each value followed by a comma and space.

Question 3

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 loop starts with i = 0 and increments i by 1 each time it runs, stopping when i equals 15. Thus, it runs 15 times, printing "Hello" each time.

Question 4

What is the output of the following code fragment?
Int i = 1;
Int sum = 0;
While (i <= 15)
{
Sum = sum + i;
I++;
}
System.out.println("The value of sum is " + sum);
A) The value of sum is 0
B) The value of sum is 105
C) The value of sum is 120
D) The value of sum is 136

Accepted Answer

The code calculates the sum of integers from 1 to 15. The sum of the first 15 natural numbers is 120.

Question 5

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 loop condition is `i <= 10`, and `i` starts at 1. After the first iteration, `i` becomes 11, which breaks the loop, so the message is printed only once.

Question 6

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 loop increments i by 2 each time. When i reaches 15, it is set to 19, and the loop continues until i is no longer less than 20.

Question 7

How many times does the following code fragment display "Hi"?
Int i = 10;
While (i >= 0)
{
System.out.println("Hi");
I--;
}
A) 9 times
B) 10 times
C) 11 times
D) 12 times

Accepted Answer

The loop starts with i = 10 and continues while i is greater than or equal to 0, decrementing i each time. This results in 11 iterations (from 10 to 0 inclusive).

Question 8

What are the values of i and j after the following code fragment runs?
Int i = 60;
Int j = 50;
Int count = 0;
While (count < 5)
{
I = i + i;
I = i + 1;
J = j - 1;
J = j - j;
Count++;
}
System.out.println("i=" + i + ", j=" + j);
A) i = 1951, j = 0
B) i = 1951, j = 45
C) i = 65, j = 1
D) i = 65, j = 45

Accepted Answer

The loop runs 5 times, doubling i and adding 1 each time, while j is set to 0 in each iteration.

Question 9

How many times does the code snippet given below display "Loop Execution"?
Int i = 1;
While (i != 10)
{
System.out.println ("Loop Execution");
I++;
}
A) Infinite times
B) 8 times
C) 9 times
D) 10 times

Accepted Answer

The loop starts with i = 1 and increments i by 1 each time it executes. It will execute until i equals 10, so it will run 9 times (from i = 1 to i = 9).

Question 10

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

Question 11

What is the output of the code snippet given below?
Int i = 0;
While (i != 9)
{
System.out.println("" + i);
I = i + 2;
}
A) No output
B) 0 2 4 6 8
C) 10 12 14 16 18 …. (infinite loop)
D) 0 2 4 6 8 10 12 14 …. (infinite loop)

Accepted Answer

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

Question 12

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

Question 13

What are the values of i and j after the following code snippet is run?
Int i = 10;
Int j = 20;
Int count = 0;
While (count < 5)
{
I = i + i;
I = i + 1;
J = j - 1;
J = j - j;
Count++;
}
System.out.println("i = " + i + ", j = " + j);
A) i = 45, j = 1
B) i = 351, j = 0
C) i = 351, j = 2
D) i = 1311, j = 35

Accepted Answer

The loop runs 5 times. Each time, i is doubled and incremented by 1, and j is set to 0. After 5 iterations, i becomes 351 and j remains 0.

Question 14

Which error type does the "off-by-one" error belong to?
A) Syntax error
B) Compile-time error
C) Run-time error
D) Infinite loop

Accepted Answer

An "off-by-one" error is a logical error that occurs during the execution of a program, making it a run-time error. It typically happens when a loop iterates one time too many or too few.

Question 15

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 loop increments 'i' by 2 each time, starting from 0, until 'i' is less than 125. This results in 63 iterations, so 'j' is incremented 63 times.

Question 16

What is the output of the following code fragment?
Int i = 1;
Int sum = 0;
While (i <= 11)
{
Sum = sum + i;
I++;
}
System.out.println("The value of sum is " + sum);
A) The value of sum is 65
B) The value of sum is 66
C) The value of sum is 55
D) The value of sum is 56

Accepted Answer

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

Question 17

What is the output of the following code snippet?
Int i = 1;
While (i < 10)
{
System.out.print(i + " ");
I = i + 2;
If (i == 5)
{
I = 9;
}
}
A) 1 3 5
B) 1 3 9
C) 1 3 5 7 9
D) 1 3 5 9

Accepted Answer

The loop starts with i=1, prints 1, increments i by 2 to 3, prints 3, increments i by 2 to 5, then sets i to 9 due to the if condition, prints 9, and exits the loop as i is no longer less than 10.

Question 18

How many times will the following loop run?
Int i = 0;
While (i < 10)
{
System.out.println(i);
I++;
}
A) 0
B) 8
C) 9
D) 10

Accepted Answer

The loop will run 10 times because it starts with i = 0 and continues until i is no longer less than 10, incrementing i by 1 each time.

Question 19

What is the output of the following code snippet? double a = 2;
Int n = 16;
Double r = 1;
Double b = a;
Int i = n;
While (i > 0)
{
If (i % 2 == 0) // n is even
{
B = b * b;
I = i / 2;
}
Else
{
R = r * b;
I--;
}
}
System.out.println("r = " + r);
A) r = 16.0
B) r = 128.0
C) r = 4096.0
D) r = 65536.0

Accepted Answer

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

Question 20

What is the output of the code fragment given below?
Int i = 0;
Int j = 0;
While (i < 27)
{
I = i + 2;
J++;
}
System.out.println("j=" + j);
A) j=27
B) j=12
C) j=13
D) j=14

Accepted Answer

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

Quiz 6: Loops

What output does this while loop generate? j = 6; While (j > 0) { System.out.print(j + ", ") ; J--; }

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

What is the output of the following code fragment? Int i = 1; Int sum = 0; While (i <= 15) { Sum = sum + i; I++; } System.out.println("The value of sum is " + sum) ;

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; }

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; } }

How many times does the following code fragment display "Hi"? Int i = 10; While (i >= 0) { System.out.println("Hi") ; I--; }

What are the values of i and j after the following code fragment runs? Int i = 60; Int j = 50; Int count = 0; While (count < 5) { I = i + i; I = i + 1; J = j - 1; J = j - j; Count++; } System.out.println("i=" + i + ", j=" + j) ;

How many times does the code snippet given below display "Loop Execution"? Int i = 1; While (i != 10) { System.out.println ("Loop Execution") ; I++; }

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

What is the output of the code snippet given below? Int i = 0; While (i != 9) { System.out.println("" + i) ; I = i + 2; }

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

What are the values of i and j after the following code snippet is run? Int i = 10; Int j = 20; Int count = 0; While (count < 5) { I = i + i; I = i + 1; J = j - 1; J = j - j; Count++; } System.out.println("i = " + i + ", j = " + j) ;

Which error type does the "off-by-one" error belong to?

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 output of the following code fragment? Int i = 1; Int sum = 0; While (i <= 11) { Sum = sum + i; I++; } System.out.println("The value of sum is " + sum) ;

What is the output of the following code snippet? Int i = 1; While (i < 10) { System.out.print(i + " ") ; I = i + 2; If (i == 5) { I = 9; } }

How many times will the following loop run? Int i = 0; While (i < 10) { System.out.println(i) ; I++; }

What is the output of the following code snippet? double a = 2; Int n = 16; Double r = 1; Double b = a; Int i = n; While (i > 0) { If (i % 2 == 0) // n is even { B = b * b; I = i / 2; } Else { R = r * b; I--; } } System.out.println("r = " + r) ;

What is the output of the code fragment given below? Int i = 0; Int j = 0; While (i < 27) { I = i + 2; J++; } System.out.println("j=" + j) ;