EBK DATA STRUCTURES AND ALGORITHMS IN C
4th Edition
ISBN: 9781285415017
Author: DROZDEK
Publisher: YUZU
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Chapter 4, Problem 8E
Program Plan Intro
Stack:
Stack is a container in which elements inserted and removed in LIFO (Last In First Out) manner.
- The “top” is address of top element of stack.
- Basic stack operations are given below:
- push(): Insert an object into stack top.
- pop(): Delete object in stack top.
- topEl(): Get object in stack top.
- isEmpty(): Check stack is empty or not.
Queue:
- Queue is another data structure in which insertion and removal of elements are in FIFO (First In First Out) manner.
- Basic operations are given below:
- Enqueue(): Insert an element into back of queue
- Dequeue(): Remove an item from front of queue
- front(): Get first element of queue without removal of it.
- isEmpty(): Check queue is empty or not.
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Given the following Extended-BNF grammar of the basic mathematical expressions:
Show the derivation steps for the expression: ( 2 + 3 ) * 6 – 20 / ( 3 + 1 )
Draw the parsing tree of this expression.
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Whentheuserenters!!,themostrecentcommandinthehistoryisexecuted.In the example above, if the user entered the command:
Osh> !!
The ‘ls -l’ command should be executed and echoed on user’s screen. The command should also be placed in the history buffer as the next command.
Whentheuserentersasingle!followedbyanintegerN,theNthcommandin the history is executed. In the example above, if the user entered the command:
Osh> ! 3
The ‘ps’ command should be executed and echoed on the user’s screen. The command should also be placed in the history buffer as the next command.
Error handling:
The program should also manage basic error handling. For example, if there are no commands in the history, entering !! should result in a message “No commands in history.” Also, if there is no command corresponding to the number entered with the single !, the program should output "No such command in history."
Activity No.
Activity
Time (weeks)
Immediate Predecessors
1
Requirements collection
3
2
Requirements structuring
4
1
3
Process analysis
3
2
4
Data analysis
3
2
5
Logical design
50
3,4
6
Physical design
5
5
7
Implementation
6
6
c. Using the information from part b, prepare a network diagram. Identify the critical path.
Chapter 4 Solutions
EBK DATA STRUCTURES AND ALGORITHMS IN C
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