Unit 3 Exam

Question 1

Min number of iterations for do while

Answer 1

1

Question 2

Min number of iterations for while

Answer 2

0, because boolean expression is first so if it is false loop never runs

Question 3

What happens with continue inside a for

Answer 3

Skips the code below it and increments

Question 4

Min number of iterations for for

Answer 4

1

Question 5

What does empty boolean expression in for do

Answer 5

Always evaluates to true

Question 6

for(;;){
SOP(“hello”)
}

Answer 6

Infinite loop

Question 7

Reference of array

Answer 7

Address where data is stored in RAM

Question 8

Index of array

Answer 8

Integer between 0 and array size - 1

Question 9

int [] nums = new int [10]

Answer 9

int = data type
[ ] = array
nums = array name
new = reserves enough RAM to store size values
10 = size

Question 10

nums [1] = 3;
nums [3] = 20;
nums [7] = nums [nums [1]] - 8;

Answer 10

nums [7] is 12

Question 11

.length

Answer 11

Constant that is equal to the size of the array
Used for iterating through an array

Question 12

Initializing arrays

Answer 12

int [] nums = new int [50]; // all values set to 0
String [] days = {“Mon”, “Tues”, “Wed”};

Question 13

Passing arrays to methods

Answer 13

When an array is passed using a method, the reference is passed by value
This means that when an array that is passed through a method is modified, it is changing the original

Question 14

2d arrays

Answer 14

Each element in the array is also an array
Syntax int [ ] [ ] arr

Question 15

Iterating through a 2d array

Answer 15

for(int row = 0; row < a.length; row++){
for(int col = 0; col < a[row].length; col++){
System.out.print(a[row][col] + “ “);
} // for
System.out.println(“ “);
} // for