Question

C++ Programming Assignment S Mammal Lab This lab's goal is to give you some practice using inheritance, virtual functions, pointers, dynamic memory allocation, random numbers, and polymorphism. To complete the lab implement the following steps: Create a class called Mammal. All mammals have a weight and a name, so its data should be the mammal's weight and name. Provide a default constructor that sets the mammal's weight to 0 and name to null, and another constructor that allows the weight and name to be set by the client. To allow tracking of how your code executes, your constructors and destructors should each output a message when they are called (e.g.. Invoking Mammal default constructor" for the default constructor). Your Mammal class should also have a method called Speak that cannot be implemented. That is, it should be declared as a purely virtual function. Your class should also have Get and Set methods to allow the weight and name to be accessed 1. 2. From the Mammal class, derive Dog, Cat, Horse, and Pig classes. The derived classes should each have constructor and destructors that output an appropriate message (e g, the Dog constructor outputs Invoking Dog constructorand that allow the weight and Comment (US1) Perhaps something like this to clarify name of the Mammal to be initialized (think member initialization list) The derived classes should each have a member function called Speak that overrides the Mammal Speak version. Dog Speak should output Woof, Cat Speak should output Meow Comment lGMICD2RI!!nderstand hought there, but it changes the meaning It's not cause and effect I cas see bow case and Horse Speak should output "I'm Mr. Ed,"and Pig Speak should output "Oink effect would be implied with the allows beag te gular form please leave thr here, but change alows to allow Thai' 3. Write a main function that uses the Mammal and derived classes as needed to do the following. You must perform the actions below in the sequence described i.e., do not take a shortcut around using dynamic memory allocation deallocation and virtual methods since they are the whole point of the lab) Use the randO function to generate a random weight between 0 and 150 pounds. (Think modulus. Note: they are small horses and pigs.) Your program should use a seed value of 100 and set the seed only once. a. b. Prompt the user to make an animal selection (eg., (1) for dog, (2) for cat, (3) for horse, and (4) for pig) and to enter a name for the animal. Dynamically create a Dog, Cat, Horse, or Pig object (depending on what the user entered) and initialize it with a constructor to which is passed its weight and name. Save the object (think array). Repeat steps a. and b. 4 more times. You do not know what animals the user will select or in what order, so you must figure out how to create and store the appropriate objects. c. d. After the user has entered all 5 selections, execute another loop that cycles through the 5 selections and invokes the Speak method and also displays the name and weight for the animal. If you have done it properly, each of your outputs will correspond to the type of Mammal the user selected in the order he or she entered them To give you an idea of the general criteria that will be used for grading, here is a checklist that you might find helpful: Program executes without crashing Appropriate Internal Documentation Base Mammal Class: Correct Private Data Members Constructors function appropriately (correct number of constructors, numberof arguments, output of messages, etc.) Correct get and set functions Derived Dog, Cat, Pig, and Horse classes Correct Private Data Members Constructors function appropriately (correct number of constructors, number of arguments, output of messages, etc.) Correct get and set functions Speak function implementation Dynamic allocation of mammals Random generation of weights and correct seed value Output contains appropriate information Array used to store 5 mammals correctly Memory is de allocated appropriately

Answer 1

#include<iostream>
#include<cstdlib>
#include<string.h>

using namespace std;

class Mammal
{
private:
float weight;
char name[30];
public:
// CONSTRUCTOR member function
Mammal()
{
weight=0;
strcpy(name,"null");
cout<<"Invoking Mammal default constructor"<<endl;
}
Mammal(float w, char s[])
{
weight=w;
strcpy(name,s);
}
// DESTRUCTOR member function
~Mammal()
{
cout<<"Invoking Mammal destructor"<<endl;
}
// MUTATOR member functions
void setWeight(float w)
{
weight=w;
}
void setName(char s[])
{
strcpy(name,s);
}
// ACCESSOR member functions
float getWeight()
{
return weight;
}
string getName()
{
return name;
}
// PURE VIRTUAL function
virtual void speak()=0;
};

class Dog:public Mammal
{
public:
// CONSTRUCTOR member function
Dog()
{
cout<<"Invoking Dog default constructor"<<endl;
}
~Dog()
{
cout<<"Invoking Dog destructor"<<endl;
}
Dog(float w, char s[]):Mammal(w,s){}

void speak()
{
cout<<"Woof"<<endl;
}
};

class Cat:public Mammal
{
public:
// CONSTRUCTOR member function
Cat()
{
cout<<"Invoking Cat default constructor"<<endl;
}
~Cat()
{
cout<<"Invoking Cat destructor"<<endl;
}
Cat(float w, char s[]):Mammal(w,s){}

void speak()
{
cout<<"Meow"<<endl;
}
};

class Horse:public Mammal
{
public:
// CONSTRUCTOR member function
Horse()
{
cout<<"Invoking Horse default constructor"<<endl;
}
~Horse()
{
cout<<"Invoking Horse destructor"<<endl;
}
Horse(float w, char s[]):Mammal(w,s){}

void speak()
{
cout<<"I'm Mr. Ed"<<endl;
}
};

class Pig:public Mammal
{
public:
// CONSTRUCTOR member function
Pig()
{
cout<<"Invoking Pig default constructor"<<endl;
}
~Pig()
{
cout<<"Invoking Pig destructor"<<endl;
}
Pig(float w, char s[]):Mammal(w,s){}

void speak()
{
cout<<"Oink"<<endl;
}
};

int main()
{
char name[30];
srand(100);
int weight;

Mammal *m[5];
Dog *d;
Cat *c;
Horse *h;
Pig *p;
int i,j=0;

do{
cout<<"1.Dog"<<endl<<"2.Cat"<<endl<<"3.Horse"<<endl<<"4.Pig"<<endl<<endl;
cout<<"Select any animal from the above"<<endl;
cin>>i;

if(i<1 && i>4) continue;

cout<<"Enter the name for animal"<<endl;
cin>>name;
weight=rand()%151;
switch(i)
{
case 1:
{
d = new Dog(weight,name);
m[j++]=d;

}
break;
case 2:
{
c = new Cat(weight,name);

m[j++]=c;
}
break;
case 3:
{
h = new Horse(weight,name);
m[j++]=h;

}
break;
case 4:
{
p = new Pig(weight,name);
m[j++]=p;

}
break;
}
if(j==5) break;
}while(1);
cout<<endl;

for(i=0; i<5 ; i++)
{
cout<<"Speak of the animal is: ";
m[i]->speak();
cout<<"Name of the animal is: "<<m[i]->getName();
cout<<endl;
cout<<"Weight of the animal is: "<<m[i]->getWeight();
cout<<endl;
cout<<endl;
}

/* Deallocation of memory */
delete d;
delete c;
delete h;
delete p;

return 0;
}