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Lab 6: Heaps

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COE428 Lab 6: Heaps
Heap add, delete and heapSort
1. IMPORTANT: Two week lab
Note that you have two weeks to complete this lab. This lab must be submitted at least 48 hours
before the beginning of your next lab period.
2. Prelab preparation
Before coming to the lab you should:
· Read the lab. Try to prepare any questions you may have about the lab.
· Refer to Lab Guide.
· Create your lab directory for lab6. (i.e. use mkdir lab6 within your coe428 directory.)
· Change to your coe428/lab6 and unzip the lab6.zip file with the command:
unzip /home/courses/coe428/lab6/lab6.zip
Ensure that you have downloaded properly by entering the command: make
No errors should be reported.
Theory: XML tree representation
The XML language is a textual encoding of a tree data structure. The first start-tag
matches the last end-tag and represents the root of the tree. Everything between thesetags represent the root’s children (which may be empty or be trees).
The table below gives some examples.
Description XML
Tree with root node only <node>
</node>
Tree with root node and 1 child <node>
<node></node>
7/21/23, 7:35 PM COE428 Lab 6: Heaps
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</node>
Tree with root node and 3 children <node>
<node></node>
<node></node>
<node></node>
</node>
Root with 2 children, 2nd child has 1 child <node>
<node></node>
<node>
<node></node>
</node>
</node>
Node identification
The XML tree description above does not include information about the nodes. This canbe fixed by allowing start-tags to have additional information associated with them.
For example, a tree with a single root node with the information “foo” associated with itcan be expressed in XML as <node id=”foo”></node>.
Similarly, a tree with a root (value 5) and two children (values 2 and 7) can be
expressed in XML as:
<node id=”5″><node id=”2″></node><node id=”7″></node></node>
(Note: this is also a valid Binary Search Tree.)
Requirements Summary
Your program must:
1.Read integers from stdin and add each one to a Heap.
2.Print the Heap tree structure as XML.
3.Print the integers in both sorted and reverse-sorted order.
Example
Suppose that the input to the program is:
15
20
10
7/21/23, 7:35 PM COE428 Lab 6: Heaps
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3
The tree heap data structure will look like:
The program then prints the tree structure of the heap as an XML expression. The
output is:
<node id=”20″><node id=”15″><node id=”3″></node></node><node id=”10″></node></node>
Next, the program deletes items one-by-one from the heap. As each item is deleted, itsvalue is printed and also pushed onto a stack. The output is the sorted numbers
(descending):
20
15
10
3
Finally, the program pops the stack and prints each item producing the output:
3
10
15
20
Implementation Notes
7/21/23, 7:35 PM COE428 Lab 6: Heaps
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To implement the algorithm in C, you need a main() function that reads stdin and
processes each line. You also need to implement a Heap and a Stack.
You must use separate C source code files for each of these. The files are:
main.c
The main() function in this file reads stdin one line at a time. You are provided
with a skeleton implementation of main() that handles the “read integers from
stdin loop”.
However, you have to code the actual algorithm. You will need the Heap and the
Stack for this.
intStack.c
Again, you are provided with a skeletal version of this file. You need to implementthe 3 functions (push, pop and isEmpty). The comments describing what these
functions do must not be modified.
Note
The stack you used in the previous lab should work for this lab. Just copy it!
intHeap.c
Again, you are provided with a skeletal version of this file. You need to implementthe 3 functions (heapAdd, heapDelete and heapSize). The comments describing
what these functions do must not be modified.
Submit your lab
1. Go to your coe428 directory
2. Zip your lab6 directory by using the following command:
zip -r lab6.zip lab6/
3. Submit the lab6.zip file using the following command:
submit coe428 lab6 lab6.zip
by Ken Clowes, revised by Olivia D

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