WGU C949 Data Structures and Algorithms
Problem Solving Exam Questions and With
Distinction level Marking scheme updated
2024/2025
What must be added to all input methods for them to work? -
correct answer throws IO Exception
What does the charAt () method do? - correct answer Returns
a character at the specific position in the string object.
What does the parse.Int() method do? - correct answer
Converts the string type into an integer.
What is an array? - correct answer A container object that
holds multiple values of the same type.
What are the two types of data in java? - correct answer
Primitive types (int, char, boolean,long, double etc) and objects.
Why must you use the key word "new" when creating an array? -
correct answer Arrays in java are treated as objects.
What does the [] operator tell the compiler? - correct answer
That we are naming an array object.
,What are the steps to creating an array? - correct answer
MRCNL: Main(), Reference, Create an Array, Number of Items,
Loop.
long [] arr is; an example of: - correct answer Referencing an
array.
arr = new long [100];is an example of: - correct answer
Creating an array.
int nElems = 0; is an example of: - correct answer The
number of items in the array .
int x; is an example of: - correct answer A loop creator.
What does the searchKey variable do? - correct answer IT
holds the value we are looking for.
What are the three steps to delete an item in an array? -
correct answer 1.Search for the item
2. Find the item
3. Move the items with a higher index value down to fill the
"hole"
First two steps of object-oriented approach? - correct answer
1. Separate the data structure storage from the rest of the
program(now called the user).
, 2. Improve the communication between the storage structure
and the user.
Breaking up the program into classes does what? - correct
answer Makes it easier to design, understand, modify and
maintain the program.
What are the steps to setting up an array class with a
constructor? - correct answer RCCSGE: Reference the array,
Constructor, Create an Array, Set Value, Get Value, End Class.
private long[] a; is an example of: - correct answer
Referencing an array.
public LowArray(int size) is an example of what? Note that
LowArray is also the name of the class. - correct answer
Creating a Constructor.
{a = new long [size]; } is an example of what? - correct
answer Creating an array
public void setElement(int index, long value)
{a[index] = value;
is an example of what? - correct answer Set value
public long getElem(int index)
Problem Solving Exam Questions and With
Distinction level Marking scheme updated
2024/2025
What must be added to all input methods for them to work? -
correct answer throws IO Exception
What does the charAt () method do? - correct answer Returns
a character at the specific position in the string object.
What does the parse.Int() method do? - correct answer
Converts the string type into an integer.
What is an array? - correct answer A container object that
holds multiple values of the same type.
What are the two types of data in java? - correct answer
Primitive types (int, char, boolean,long, double etc) and objects.
Why must you use the key word "new" when creating an array? -
correct answer Arrays in java are treated as objects.
What does the [] operator tell the compiler? - correct answer
That we are naming an array object.
,What are the steps to creating an array? - correct answer
MRCNL: Main(), Reference, Create an Array, Number of Items,
Loop.
long [] arr is; an example of: - correct answer Referencing an
array.
arr = new long [100];is an example of: - correct answer
Creating an array.
int nElems = 0; is an example of: - correct answer The
number of items in the array .
int x; is an example of: - correct answer A loop creator.
What does the searchKey variable do? - correct answer IT
holds the value we are looking for.
What are the three steps to delete an item in an array? -
correct answer 1.Search for the item
2. Find the item
3. Move the items with a higher index value down to fill the
"hole"
First two steps of object-oriented approach? - correct answer
1. Separate the data structure storage from the rest of the
program(now called the user).
, 2. Improve the communication between the storage structure
and the user.
Breaking up the program into classes does what? - correct
answer Makes it easier to design, understand, modify and
maintain the program.
What are the steps to setting up an array class with a
constructor? - correct answer RCCSGE: Reference the array,
Constructor, Create an Array, Set Value, Get Value, End Class.
private long[] a; is an example of: - correct answer
Referencing an array.
public LowArray(int size) is an example of what? Note that
LowArray is also the name of the class. - correct answer
Creating a Constructor.
{a = new long [size]; } is an example of what? - correct
answer Creating an array
public void setElement(int index, long value)
{a[index] = value;
is an example of what? - correct answer Set value
public long getElem(int index)
