AP CS A Java Iteration Practice 3/4

Which of the following code segments produces the output "987654321" ?

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Consider the following methods.

Which of the following best describes the conditions under which methodOne and methodTwo return the same value?

• When a and b are both even

• When a and b are both odd

• When a is even and b is odd

• When a % b is equal to zero

• When a % b is equal to one

Consider the following method definition. The method printAllCharacters is intended to print out every character in str, starting with the character at index 0.

The following statement is found in the same class as the printAllCharacters method.

printAllCharacters("ABCDEFG");

Which choice best describes the difference, if any, in the behavior of this statement that will result from changing x < str.length() to x <= str.length() in line 3 of the method?

• The method call will print fewer characters than it did before the change because the loop will iterate fewer times.

• The method call will print more characters than it did before the change because the loop will iterate more times.

• The method call, which worked correctly before the change, will now cause a run-time error because it attempts to access a character at index 7 in a string whose last element is at index 6.

• The method call, which worked correctly before the change, will now cause a run-time error because it attempts to access a character at index 8 in a string whose last element is at index 7.

• The behavior of the code segment will remain unchanged.

Consider the following code segments. Code segment 2 is a revision of code segment 1 in which the loop increment has been changed.

Code segment 1 prints the sum of the integers from 1 through 30, inclusive. Which of the following best explains how the output changes from code segment 1 to code segment 2 ?

• Code segment 1 and code segment 2 will produce the same output.

• Code segment 2 will print the sum of only the even integers from 1 through 30, inclusive because it starts sum at zero, increments k by twos, and terminates when k exceeds 30.

• Code segment 2 will print the sum of only the odd integers from 1 through 30, inclusive because it starts k at one, increments k by twos, and terminates when k exceeds 30.

• Code segment 2 will print the sum of only the even integers from 1 through 60, inclusive because it starts sum at zero, increments k by twos, and iterates 30 times.

• Code segment 2 will print the sum of only the odd integers from 1 through 60, inclusive because it starts k at one, increments k by twos, and iterates 30 times.

Consider the following code segments.

Which of the code segments above will produce the following output?

1 4 7 10 13 16 19

• I only

• II only

• I and II only

• II and III only

• I, II, and III