Question 1

What does the method below return?
Int findSomething (String str)
{
Int position = 0;
While (position < str.length() &&
(str.charAt (position) != 'e'))
{
Position++;
}
Return position;
}

Accepted Answer

The method iterates through the string until it finds the first occurrence of 'e' or reaches the end of the string, returning the position of 'e' or the string's length if 'e' is not found.

Question 2

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

The code has unrelated expressions in the loop header, doesn't match the typical for loop idiom, and the loop iteration is unclear.

Question 3

What does the following code snippet print?
Int a = 120;
Int b = 90;
Int n1 = Math.abs(a);
Int n2 = Math.abs(b);
Int result = 1;
For (int k = 1; k <= n1 && k <= n2; k++)
{
If (n1 % k == 0 && n2 % k == 0)
{
Result = k;
}
}
System.out.println(result);

Accepted Answer

The code calculates the greatest common divisor (GCD) of 120 and 90, which is 30.

Question 4

What will be printed by the statements below?
Int val = 1;
Int sum = 0;
While (val < 5)
{
Sum = sum + val;
Val++;
}
System.out.print (sum);

Accepted Answer

The loop runs while val is less than 5, adding val to sum each time. The values added are 1, 2, 3, and 4, resulting in a sum of 10.

Question 5

Which statement about this code snippet is accurate?
Int years = 50;
Double balance = 10000;
Double targetBalance = 20000;
Double rate = 3;
For (int i = 1; i <= years; i++)
{
If (balance >= targetBalance)
{
I = years + 1;
}
Else
{
Double interest = balance * rate / 100;
Balance = balance + interest;
}
}

Accepted Answer

The loop is designed to run at most 50 times, but it will stop earlier if the balance reaches or exceeds the targetBalance due to the condition inside the loop.

Question 6

What is the output of the following code snippet?
Int counter = 1;
For (double i = 0.01; i <= 1.0; i = i + 0.01)
{
Counter++;
}
System.out.println(counter);

Accepted Answer

The loop starts with i = 0.01 and increments by 0.01 until i is greater than 1.0. This results in 100 iterations, incrementing the counter from 1 to 101.

Question 7

What will be printed by the statements below? for (int ctr = 0; ctr < 10; ctr++)
{
System.out.print (ctr + " ");
}

Accepted Answer

The loop starts at 0 and increments by 1 each time, printing numbers from 0 to 9.

Question 8

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

Accepted Answer

The answer of Which of the following loops will print...

Question 9

What will be printed by the statements below?
Int val = 1;
Int sum = 0;
While (val < 5)
{
Sum = 0;
Sum = sum + val;
Val++;
}
System.out.print (sum);

Accepted Answer

The answer of What will be printed by the statements...

Question 10

What will be printed by the statements below?
Int a = 10;
While (a > 5)
{
A = a - 2;
System.out.print (a + " ");
}

Accepted Answer

The answer of What will be printed by the statements...

Question 11

What is the output of the code below? for (int val = 0; val < 4; val ++)
{
System.out.print ("+");
For (int num = 0; num < val; num++)
{
System.out.print ("0");
}
}

Accepted Answer

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

Question 12

What does the following loop compute? Scanner in = new Scanner (System.in);
Int sum = 0;
Int count = 0;
While (in.hasNextInt())
{
Int value = in.nextInt();
If (value > 0)
{
Sum += value;
Count++;
}
}
Double result = (sum * 1.0)/count;

Accepted Answer

The loop calculates the sum of all positive integers and counts them, then computes the average by dividing the sum by the count of positive integers.

Question 13

How many times does the following loop execute? for (double d = 1; d != 10; d++)
{
D = d / 3;
System.out.print(d + " ");
}

Accepted Answer

The loop executes an infinite number of times because the condition `d != 10` will never be false due to the imprecision of floating-point arithmetic. The variable `d` is a double, and incrementing it by 1 may not exactly reach 10 due to precision errors.

Question 14

What will be printed by the statements below?
Int a = 10;
While (a > 5)
{
System.out.print (a + " ");
A = a - 2;
}

Accepted Answer

The answer of What will be printed by the statements...

Question 15

What will be printed by the statements below? for (int ctr = 10; ctr > 5; ctr--)
{
System.out.print (ctr + " ");
}

Accepted Answer

The loop starts with ctr at 10 and decrements it by 1 each iteration, printing the value until ctr is greater than 5. Therefore, it prints 10 9 8 7 6.

Question 16

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? Scanner in = new Scanner (System.in);
Int sum = 0;
Do {
Sum += in.nextInt();
}
While (/* put condition here */)

Accepted Answer

The loop should continue while the sum is less than or equal to 100, so the correct condition is `sum <= 100`.

Question 17

Which of the following is considered a loop with a problematic condition?

Accepted Answer

The loop condition `i != n` can be problematic because if `i` skips over `n` due to an increment step or floating-point arithmetic, the loop may never terminate.

Question 18

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

Accepted Answer

The loop in choice A starts at 1 and increments by 2 each time, printing odd numbers until it reaches 19.

Question 19

Which of the following for loops is illegal?

Accepted Answer

For loop in option B is missing the second part of the parentheses which should declare the loop condition.

Question 20

Is the code snippet written below legal? String s = "1234";
For (int i = 0; i <= 5; i++)
{
System.out.print);
}

Accepted Answer

The answer of Is the code snippet written below legal?...

Quiz 6: Loops

What does the method below return? Int findSomething (String str) { Int position = 0; While (position < str.length() && (str.charAt (position) != 'e') ) { Position++; } Return position; }

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

What does the following code snippet print? Int a = 120; Int b = 90; Int n1 = Math.abs(a) ; Int n2 = Math.abs(b) ; Int result = 1; For (int k = 1; k <= n1 && k <= n2; k++) { If (n1 % k == 0 && n2 % k == 0) { Result = k; } } System.out.println(result) ;

What will be printed by the statements below? Int val = 1; Int sum = 0; While (val < 5) { Sum = sum + val; Val++; } System.out.print (sum) ;

What is the output of the following code snippet? Int counter = 1; For (double i = 0.01; i <= 1.0; i = i + 0.01) { Counter++; } System.out.println(counter) ;

What will be printed by the statements below? for (int ctr = 0; ctr < 10; ctr++) { System.out.print (ctr + " ") ; }

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

What will be printed by the statements below? Int val = 1; Int sum = 0; While (val < 5) { Sum = 0; Sum = sum + val; Val++; } System.out.print (sum) ;

What will be printed by the statements below? Int a = 10; While (a > 5) { A = a - 2; System.out.print (a + " ") ; }

What is the output of the code below? for (int val = 0; val < 4; val ++) { System.out.print ("+") ; For (int num = 0; num < val; num++) { System.out.print ("0") ; } }

What does the following loop compute? Scanner in = new Scanner (System.in) ; Int sum = 0; Int count = 0; While (in.hasNextInt() ) { Int value = in.nextInt() ; If (value > 0) { Sum += value; Count++; } } Double result = (sum * 1.0) /count;

How many times does the following loop execute? for (double d = 1; d != 10; d++) { D = d / 3; System.out.print(d + " ") ; }

What will be printed by the statements below? Int a = 10; While (a > 5) { System.out.print (a + " ") ; A = a - 2; }

What will be printed by the statements below? for (int ctr = 10; ctr > 5; ctr--) { System.out.print (ctr + " ") ; }

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? Scanner in = new Scanner (System.in) ; Int sum = 0; Do { Sum += in.nextInt() ; } While (/* put condition here */)

Which of the following is considered a loop with a problematic condition?

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

Which of the following for loops is illegal?

Is the code snippet written below legal? String s = "1234"; For (int i = 0; i <= 5; i++) { System.out.print) ; }