CS 180 Final Exam Practice.pdf - CS 180 Practice Questions...

CS 180 Practice Questions
_____ 1. Consider the following method.
public static int mystery(int[] arr) {
int x = 0;
for(int k = 0; k < arr.length; k = k + 2) {
x = x + arr[k];
}
return x;
}
Assume that the array nums has been declared and initialized as follows.
int[] nums = {3, 6, 1, 0, 1, 4, 2};
What value will be returned as a result of the call mystery(nums) ?
(A) 5
(B) 6
(C) 7
(D) 10
(E) 17

Questions 2-3 refer to the following information.
Consider the following partial class declaration.
public class SomeClass {
private int myA;
private int myB;
private int myC;
//Constructor(s) not shown
public int getA() {
return myA;
}
public void setB(int value) {
myB = value;
}
}
_____ 2. The following declaration appears in another class.
SomeClass obj = new SomeClass();
Which of the following code segments will compile without error?
SomeClass will allow other classes to access but not modify the
value of myC ?

_____ 4. Consider the following code segment.
int x = 7;
int y = 3;
if((x < 10) && (y < 0)) {
System.out.println(“Value is: “ + x * y);
}
else {
System.out.println(“Value is: “ + x / y);
}
What is printed as a result of executing the code segment?
_____ 5. Consider the following method.
public ArrayList<Integer> mystery(int n) {
ArrayList<Integer> seq = new ArrayList<Integer>();
for(int k = 1; k <= n; k++) {
seq.add(new Integer(k * k + 3));
}
return seq;
}
What is printed as a result of executing the following statement?
System.out.println(mystery(6));
(A) [3, 4, 7, 12, 19, 28]
(B) [3, 4, 7, 12, 19, 28, 39]
(C) [4, 7, 12, 19, 28, 39]
(D) [39, 28, 19, 12, 7, 4]
(E) [39, 28, 19, 12, 7, 4, 3]

_____ 6. Consider the following method that is intended to determine if the double values d1 and d2
close enough to be considered equal. For example, given a tolerance of 0.001 , the values
54.32271 and 54.32294 would be considered equal.
/** @return true if d1 and d2 are within the specified tolerance,
* false otherwise
*/
public boolean almostEqual(double d1, double d2, double tolerance) {
/* missing code */
}
Which of the following should replace /* missing code */ so that almostEqual will work as
intended?
are