AP Computer Science - Java Programming CH 7 Quiz and Solutions

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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:

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

Solutions

True
True
False
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True
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True

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