6.06 Part 1 Challenge Exam

If String str1 = "Forest" and String str2 = "School"

what is the value of str1.compareTo(str2);?

• 1

• -1

• 0

• a value less than 0

Assume that age has been declared as an int variable. Which expression is true whenever age indicates that the person is a teenager?

• ((age < 20) && (age >= 13))

• ((age < 20) || (age >= 13))

• ((age <= 19) && (age < 13)

• ((age <= 19) || (age >= 13))

!((x > y) || (y <= 0)) is equivalent to which of the following expressions in the image?

• I

• II

• III

• I and III only

• II and III only

Assume that these String variables have been declared:

String str1 = "fred";

String str2 = "Fred";

What is the value of the following expression?

str1.equals(str2);

• true

• false

• fred

• equal

When is the following expression true?

!(!a || b) || (!a && b)

• If and only if a and b have different values

• If and only if a and b have the same value

• If and only if both a and b are true

• If and only if both a and b are false

What is output by the following segment of code in the image?

int i = 6;

while (i >= 2)

{

System.out.print (i + " ");

if ((i % 2) == 0)

{

i = i / 2;

} else

{

i++;

}

}

• 6 7 4 2

• 6 3 4 2

• 6 2 4 1

• 6 5 4 3 2

• 6 3 5 2

Given the following code:

if (n == 2)

{

k -= 2;

}

else if (n == 3)

{

k -= 3;

}

can be rewritten as

if (< condition >)

{

< assignment statement >;

}

where < condition > and < assignment statement > are chosen so that the rewritten code

performs the same task as the original code. Assume that both n and k are integer

variables.

Which of the following could be used as < condition >?

I. (n == 2) || (n == 3)

II. (n == 2) && (n == 3)

III. (n >= 2) && (n <= 3)

• I

• II

• III

• I & III only

• II and III only

What is printed by this code segment?

String s = "Howdy";

int i = s.length() - 1;

String total = " ;

String letter;

while (i >= 0)

{

letter = s.substring (i, i + 1);

System.out.print (i + " " + letter + " ");

i--;

}

• 4 H 3 o 2 w 1 d 0 y

• 0 H 1 o 2 W 3 d 4 y

• 4 y 3 d 2 w 1 o 0 H

• 0 y 1 d 2 w 3 o 4 H

• 0 1 2 3 4 H o w d y

Given the following code:

int i = 100;

int j = 10;

while (i > 0)

{

i = i / j;

j = 1 + j % 5;

}

What is the value of j after this code executes?

• 0

• 1

• 4

• 5

What is the value of b after the following code executes?

int a = 2;

int b = 0;

while (a < 10)

{

b = 6;

while (b > a)

{

b--;

}

a += b;

}

• 4

• 5

• 6

• 7