AP CSA 55 Question MC

• MC Mistakes & Reflections
  • Question 5
  • Question 7
  • Question 11
  • Question 14
  • Question 22
  • Question 25
  • Question 35
  • Question 37
  • Question 38
  • Overall

MC Mistakes & Reflections

• Score: 43/52 (.9/1)
• Total: .9+1.8=2.7/3
• Time: 67 minutes

  Question 5

  

• I assumed that the row and column for loops were flipped, namely that each line would contain one row of array data
• The loops were switched such that the outer for loop was looping through the columns
  • Therefore, each line corresponded to one column in the array, which would have yielded the right answer

Question 7

• Again I misread the function, I assumed the result string put a “1” if the characters at the same position were equal in both strings, yielding my answeer
• In the actual function, if the characters at the same position were equal in both strings, the same character was appended to the result
  • This results in the “1” at the end of the result string being replaced with a “0” rather than “1” yielding the correct answer

Question 11

• Here, I thought that the numbers would be concatinated with the string, resulting in 12Z
• The flaw in my logic is that first 1 and 2 would be added before being cocantinated with Z
  • This resulted in the answer of “3Z” rather than “12Z”

Question 14

• Here, I was thinking that normally the outer for loop would reference arr rather than arr[0]
• Since it was using columns, the existing reference to arr[0] is correct
• The column index is not iterable, so that resulted in the actual problem, replacing the enhanced for loop to use the iterable arr

Question 22

• Here was just a misread, I thought the array was 3x4 however it was actually a 4x4 leading to the correct answer of 16

Question 25

• I did not fully iterate through this code in my head resulting in the right answer
• If you do this problem thoroughly and on paper you will get the right answer

Question 35

• In this case I saw the general purpose of the for loop and for which elements it would print
• I misread the loop printing the value of the array rather than the index resulting in my wrong answer

Question 37

• I misread the quetion as I thought that it appended str2 to str1
• However, the actual order was str2 and then str1 resulting on str2 always having an index of 0

Question 38

• I misread the for loop thinking it would reverse the whole string
• The loop only goes for i > 0 which means it skips the first character resulting in the right answer

Overall

I think my weak areas was silly mistakes and rushing through questions. I had some time left so I could have used that to more throughly go through the questions. I could also stuedy array for loops a bit more because I made some mistakes on that