AP Computer Science - Java Programming CH 7 Quiz and Solutions

Java Programming CH 7 Quiz

True/False:

____ 1. To initialize a new array we can use: int[] list = new int[4];
____ 2. A single array variable can reference a large set of data.
____ 3. int[] list = new int[4] has elements list[1], list[2], list[3], list[4].
____ 4. Double [] myList = {2.0, 4.5, -6.3}; myList.add(3.5,2); // New array {2.0, 4.5, 3.5, -6.3}
____ 5. myList[i] - -; is equivalent to myList[i] = myList[i] – 1;
____ 6. You can print a list using System.out.print(myList);
____ 7. char[][] charArray = new char[3][5] makes an array with 3 columns and 5 rows.
____ 8. A for loop can contain a colon in it (:) to loop through rows.
____ 9. In the array below mat[2] = {1, 6, 3, 4}
1 7 -8 9
1 6 3 4
3 -5 7 2
____ 10. String[][] strs = new String[2][5] could look like this:
“Hello” “Nope” “Hello” “Nope” “Goodbye”
“Goodbye” “Nope” “Hello” “Goodbye” “Hansen”

Short Answer

Short Answer:

1. What does this section of code do?
   
2. If I were to enter the numbers 4 3 2.5 -6, what would the code above print?

Solutions

1. True
2. True
3. False
4. False
5. True
6. False
7. False
8. True
9. False
10. True

1. It takes an array of length 4 from the user and prints it.
2. 4.0 3.0 2.5 -6.0 // They all have a decimal point because they are doubles (Rational numbers).
   

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