Question

I. Create the class Item with the following members:
  1. id, a protected variable of type int
  2. name, a protected variable of type string
  3. price, a protected variable of type double
  4. a public non-default constructor which accepts three parameters to initialize the variables above

II. Create the class Chair. The class publicly inherits from Item and has the following members
  1. numLegs, a private variable of type int
  2. a non-default constructor to initialize numLegs, id, name, and price
  3. accessors and mutators for numLegs
  4. an int conversion constructor to convert from an int to a type of class Chair.
  5. a string conversion operator which returns a string consisting of the values of id, name, price, and int with spaces between the values
  6. overloaded output stream operator
  7. overloaded input stream operator

III. Write test code to create an instance of type Chair and test all members

Answer 1

//C++ program

#include<iostream>
#include <sstream>   
#include <string>

using namespace std;

class Item{
   protected:
int id;
   string name;
   double price;
   public:
       Item(int i ,string n , double p){
           id = i;
           name = n;
           price=p;
       }
};

class chair:public Item{
   private:
       int numLegs;
   public:
       chair(int i , string n , double p,int leg):Item(i,n,p){
           numLegs = leg;
       }
       void setNumLegs(int leg){
           numLegs = leg;
       }
       int getNumLegs(){
           return numLegs;
       }
       string tostring(){
           ostringstream str1,str2,str3;
  
       str1 << id;
       str2 << price;
       str3 << numLegs;
           return str1.str()+" "+name+" "+str2.str()+" "+str3.str()+"\n";
       }
       friend ostream & operator << (ostream & out , const chair &c){
           out<<c.id<<" "<<c.name<<" "<<c.price<<" "<<c.numLegs<<"\n";
           return out;
       }
       friend istream & operator >> (istream & in , chair c){
           cout<<"Enter id : ";
           in>>c.id;
           cout<<"Enter name : ";
           in>>c.name;
           cout<<"Enter price : ";
           in>>c.price;
           cout<<"Enter numLegs : ";
           in>>c.numLegs;
           return in;
       }
      
};

int main(){
   chair c (10,"Hello world",100.67,4);
   cout<<c.tostring();
  
   cout<<c;
}

//sample output