Homework #4 Solution

$30.00

Description

Focus

  • Dynamic memory

Problem:

Building on the last two assignments, we will use the classes from hw03 together with the idea of reading a file of commands as we did in hw02. The classes from hw03 should not need any changes other than perhaps a getName method for Noble.

One key difference will be that each time a warrior or a noble is defined, we will create it on the heap. We will keep track of the warriors in a vector of pointers to warriors. And similarly, we will keep track of nobles using a vector of pointers to nobles.

The input file will be named “nobleWarriors.txt“.

Commands

  • Noble. Create a Noble on the heap.

  • Warrior. Create a Warrior on the heap.

  • Hire. Call the Noble’s hire method.

  • Fire. Call the Noble’s fire method.

  • Battle. Call the Noble’s battle method.

  • Status. The status command shows the nobles, together with their armies, in a similar way that the Noble display method did in hw03. In addition, it will show the warriors who do not have an employer, either because they were fired or never hired.

  • Clear. Clear out all the nobles and warriors that were created.

Our application is going to rely on each Noble having a unique name and each Warrior having a unique name. Otherwise, how would we be sure who we were hiring (or firing). Note that this is not a requirement of the Noble and Warrior classes themselves, just of this particular use of them.

Handle errors! If a Noble with a given name already exists you should generate an error message, if we try to create another. If a Noble tries to hire a Warrior who doesn’t exist, then similarly, you should generate an error message. We have not specified the format of these messages, so we’ll leave that up to you. Make sure your code addresses any such possible errors. You do not have to worry about the format of the messages, i.e. we promise not to provide input with invalid command names or the wrong number of tokens.

Example input file:

Noble King_Arthur
Noble Lancelot_du_Lac
Noble Jim
Noble Linus_Torvalds
Noble Bill_Gates
Warrior Tarzan 10
Warrior Merlin 15
Warrior Conan 12
Warrior Spock 15
Warrior Xena 20
Warrior Hulk 8
Warrior Hercules 3
Hire Jim Spock
Hire Lancelot_du_Lac Conan
Hire King_Arthur Merlin
Hire Lancelot_du_Lac Hercules
Hire Linus_Torvalds Xena
Hire Bill_Gates Hulk
Hire King_Arthur Tarzan
Status
Fire King_Arthur Tarzan
Status
Battle King_Arthur Lancelot_du_Lac
Battle Jim Lancelot_du_Lac
Battle Linus_Torvalds Bill_Gates
Battle Bill_Gates Lancelot_du_Lac
Status
Clear
Status

Example output

Status

======

Nobles:

King_Arthur has an army of 2

Merlin: 15

Tarzan: 10

Lancelot_du_Lac has an army of 2

Conan: 12

Hercules: 3

Jim has an army of 1

Spock: 15

Linus_Torvalds has an army of 1

Xena: 20

Bill_Gates has an army of 1

Hulk: 8

Unemployed Warriors:

NONE

You don’t work for me anymore Tarzan! — King_Arthur.

Status

======

Nobles:

King_Arthur has an army of 1

Merlin: 15

Lancelot_du_Lac has an army of 2

Conan: 12

Hercules: 3

Jim has an army of 1

Spock: 15

Linus_Torvalds has an army of 1

Xena: 20

Bill_Gates has an army of 1

Hulk: 8

Unemployed Warriors:

Tarzan: 10

King_Arthur battles Lancelot_du_Lac

Mutual Annihalation: King_Arthur and Lancelot_du_Lac die at each other’s hands

Jim battles Lancelot_du_Lac

He’s dead, Jim

Linus_Torvalds battles Bill_Gates

Linus_Torvalds defeats Bill_Gates

Bill_Gates battles Lancelot_du_Lac

Oh, NO! They’re both dead! Yuck!

Status

======

Nobles:

King_Arthur has an army of 1

Merlin: 0

Lancelot_du_Lac has an army of 2

Conan: 0

Hercules: 0

Jim has an army of 1

Spock: 15

Linus_Torvalds has an army of 1

Xena: 12

Bill_Gates has an army of 1

Hulk: 0

Unemployed Warriors:

Tarzan: 10

Status

======

Nobles:

NONE

Unemployed Warriors:

NONE

Submit

Submit your program as hw04.cpp.

Grader comments:

Warning: In void hire, check if the warrior is currently not hired and only then hire him/her.

The member variable strength should be of type double.

Accessor methods should be const.

totalStrOfThisNoble and totalStrOfOtherNoble should be of type double.

The clear command should loop through both vectors, deleting each entry. Afterwards, it should clear the vectors.