2020 AP Practice Test

##MC

Score 17/40 (30 attempted)

Question 6

• I. turns 2 into a double and the rest of the operations into a double
• II. Solve 2/4 first then turns 0 into a double
• III. Solves the operations in () and then turns answer into a double

Question 8

• n1 and n2 only exits in the Points
• Have to use num1 and num2 since they are global variables
• Double values can be set equals to the integer values.

Question 9

• add() with array list will inset the value in the index.
• Everything after will be moved down.
• set() replaces the number in the specified index.

Question 11

• A. will print 10 and then subtract num
• In C. num is set to 10 and then is subtracted before printing
• 9 will be printed first, all the way to 1.

Question 12

• getName() function does not exist.
• Borrower is a variable which can be compared.
• Can directly compare to null.

Question 17

• Since j is initialized as a SuperHero object, the j.powerUp(10) method accessed is from the subclass.
• Subclass method uses super keyword with the parameter 20.
• Subclass adds p to original power value (50 + 2*10).

Question 19

• Nested for loop
• First element in each row is multiplied by two
• Sum of all the elements
• Keep track of variables when debugging

Question 20

• Nested for loop goes through each book in array
• getpages() used to get number of pages for each book
• Compare it to max page value and switch if condition is met

Question 23

• Nested for each loop goes through every element in double array.
• When using nested for loop, don’t need to use index number
• nested for loop references the element itself.

Question 24

• y is a static variable, it is linked with everything in the class
• When y is called, it increases by one
• Going through the methods, the y value ends up to be 14.

Question 31

• I. works because while loop goes through every i value and checks the condition correctly.
• II. does not work because it does not check the first value in the array.
• III. does not work because for each loop goes through every number and num index. Using i as the index will return wrong values.

Question 33

• Debug through writing the variables of the loop down.
• Row increases by one before going to the next line.
• F and j are part of the first column, so they will be printed on the top.

Question 34

• As element of the array list get removed, the index of these values changes.
• Since i is always increasing by one, some elements are skipped.
• Can fix this code by checking array list backwards.

Question 35

• Check if the values are equal.
• Increase the counter if condition is met
• If the counter is bigger than the previous stored mode value, change it.

Question 36

• When a and b are both odd
• The body of the for loop in methodOne is executed a / b times.
• The body of the while loop in methodTwo is executed a / b times only when a % b is equal to 0.
• When a % b is not equal to 0, the body of the while loop in methodTwo is executed an additional time.

Question 39

• If the first character of str is lexicographically greater than the second character of str, the method returns the result of the recursive call with a parameter that contains all but the first character of str.
• If the first character of str is lexicographically less than or equal to the second character of str, the method returns false.
• If no such character pair is found, the base case is reached and the value true is returned.

Question 40

• At compile time, methods in or inherited by the declared type determine the correctness of a non-static method call.
• obj1 is declared as an object of type A. Therefore, at compile time, there must be a message method in class A or its superclass.
• If the message method in class A is removed, the statement in line 3 will no longer compile.

FRQ

• Written Test
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