Homework Answers
- If possible, find test inputs that do not reach the mutant.
Solution:
findVal: The mutant is always reached, even if x = null.
- If possible, find test inputs that satisfy reachability but not infection for the mutant.
Solution:
findVal: Infection always occurs, even if x = null, because i always has the wrong value after initialization in the loop.
- If possible, find test inputs that satisfy reachability and infection, but not propagation for the mutant.
Solution:
findVal: As long as the last occurrence of val isn’t at numbers[0], the correct output is returned. Examples are: (numbers, val) = ([1, 1], 1) or ([-1, 1], 1) or ( null,
0).
- If possible, find test inputs that strongly kill the mutants.
Solution:
findVal: Any input with val only in numbers[0] works. An example is: ( numbers, val) = ([1, 0], 1)
Add Answer to:
1. Answer questions (a) through (d) for the mutant on line 6 in the method sum(). Sum values in an array Oparam x array to sum *Oreturn sum of values in x Othrows NullPointerException if x is null pu...
Which of the following are valid array declarations? a. int[] array- new int[10]; b. double [array...
Which of the following are valid array declarations? a. int[] array- new int[10]; b. double [array double[10]; c. charl charArray "Computer Science"; None of the above Analyze the following code: class Test public static void main(Stringl] args) System.out.println(xMethod(10); public static int xMethod(int n) System.out.println("int"); return n; public static long xMethod(long n) System.out.,println("long"); return n The program displays int followed by 10 The program displays long followed by 10. The program does not compile. None of the above. tions 3-4 are...
JAVA 1.Write a static method named getMaxEven(numbers) which takes an array of positive integers as a...
JAVA 1.Write a static method named getMaxEven(numbers) which takes an array of positive integers as a parameter. This method calculates and returns the largest even number in the list. If there are no even numbers in the array, the method should return 0. You can assume that the array is not empty. For example: Test Result int[] values = {1, 4, 5, 9}; System.out.println(getMaxEven(values)); 4 System.out.println(getMaxEven(new int[]{1, 3, 5, 9})); 0 public static int --------------------------------------------------------------------------------- 2. Write a static method...
SELF-CHECK Why did the first version of method search that passed the first test itemNotFirstElementInSingleElementArray contain...
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Java 1. Write a getCount method in the IntArrayWorker class that returns the count of the...
Java 1. Write a getCount method in the IntArrayWorker class that returns the count of the number of times a passed integer value is found in the matrix. There is already a method to test this in IntArrayWorkerTester. Just uncomment the method testGetCount() and the call to it in the main method of IntArrayWorkerTester. 2. Write a getLargest method in the IntArrayWorker class that returns the largest value in the matrix. There is already a method to test this in...
A method called linearSearch(), which takes as parameters an array of int followed by three values...
A method called linearSearch(), which takes as parameters an array of int followed by three values of type int, and returns a value of type int. The first int parameter represents a key, the second int parameter represents a starting position, and the third int parameter represents an end position. If the key occurs in the array between the start position (inclusive) and the end position (exclusive), the method returns the position of the first occurrence of the key in...
static public int[] Question() // retrieve an integer 'n' from the console // the first input...
static public int[] Question() // retrieve an integer 'n' from the console // the first input WILL be a valid integer, for 'n' only. // then read in a further 'n' integers into an array. // in the case of bad values, ignore them, and continue reading // values until enough integers have been read. // this question should never print "Bad Input" like in lab // hint: make subfunctions to reduce your code complexity return null; static public int...
Write a method called printReverse() that takes a string and uses recursion to print the contents...
Write a method called printReverse() that
takes a string and uses recursion to print the contents of the
string in reverse order. The string itself should
not be reversed; it must be left in its
original form.
The method has the following header:
void printReverse(String s, int i)
where s is a reference to the string, and i is an integer
parameter that you may use as you see fit. You do not need
to code up this method as...
/** * Returns the sum of "black hits" and "white hits" between the hiddenCode and...
/** * Returns the sum of "black hits" and "white hits" between the hiddenCode and * guess. A "black hit" indicates a matching symbol in the same position in the * hiddenCode and guess. A "white hit" indicates a matching symbol but different * position in the hiddenCode and guess that is not already accounted for with * other hits. * * Algorithm to determine the total number of hits: * ...
Define a two-dimensional int array which has 5 rows and 3 columns. The elements in array...
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Which of the following are valid array declarations? a. int[] array- new int[10]; b. double [array double[10]; c. charl charArray "Computer Science"; None of the above Analyze the following code: class Test public static void main(Stringl] args) System.out.println(xMethod(10); public static int xMethod(int n) System.out.println("int"); return n; public static long xMethod(long n) System.out.,println("long"); return n The program displays int followed by 10 The program displays long followed by 10. The program does not compile. None of the above. tions 3-4 are...
static public int[] Question() // retrieve an integer 'n' from the console // the first input WILL be a valid integer, for 'n' only. // then read in a further 'n' integers into an array. // in the case of bad values, ignore them, and continue reading // values until enough integers have been read. // this question should never print "Bad Input" like in lab // hint: make subfunctions to reduce your code complexity return null; static public int...
Write a method called printReverse() that
takes a string and uses recursion to print the contents of the
string in reverse order. The string itself should
not be reversed; it must be left in its
original form.
The method has the following header:
void printReverse(String s, int i)
where s is a reference to the string, and i is an integer
parameter that you may use as you see fit. You do not need
to code up this method as...
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