Program for demonstrating inheritance in C++

Write a menu driven program to carry out the following things in C++  :
i)Build a master table ii) Display iii) Insert a new entry
iv) Delete entry v) Edit  vi) Search for a record

Description:
Inheritance :The main advantage of inheritance is that ,we can use the predefined code.
All the predefined code resides in the form of class called as base or super class.And to use this code,we have to inherit or extend the class and these classes are called as derived classes or sub classes.
Types of Inheritance :

• Single Inheritance – There is only one super class and one sub class having one-to-one communication only.
• Multilevel Inheritance -In this the derived class can has be inherited by other class.
• Multiple Inheritance – In this,the derived class inherits the features of two base classes.
• Hierarchical Inheritance -In this,the base class has many subclasses.
• Hybrid Inheritance -Mixture of any of  the  above  inheritances

Code :
#include<iostream.h>
#include<conio.h>
#include<string.h>
#include<stdlib.h>
class base1
{
char dob[10];
char bg[3];
public:
char name[30];
void get1();
void disp1();
};
class base2
{
float ht;
float wt;
public:
void get2();
void disp2();
};
class base3
{
char policy[10];
char address[50];
public:
void get3();
void disp3();
};
class derived : public base1, public base2 ,public base3
{
char telephone[10];
char liscence[10];
public:
int present;
derived();
void get();
void disp();
};
derived :: derived()
{
present=0;
}
void base1 :: get1()
{
cout<<”\nEnter Name: “;
cin>>name;
cout<<”\nEnter DOB: “;
cin>>dob;
cout<<”\nEnter Blood group: “;
cin>>bg;
}
void base1 :: disp1()
{
cout<<”\n”<<name<<”\t”<<dob<<”\t”<<bg;
}
void base2 :: get2()
{
cout<<”\nEnter height: “;
cin>>ht;
cout<<”\nEnter weight: “;
cin>>wt;
}
void base2 :: disp2()
{
cout<<”\t”<<ht<<”\t”<<wt;
}
void base3 :: get3()
{
cout<<”\nEnter policy number: “;
cin>>policy;
cout<<”\nEnter address: “;
cin>>address ;
}
void base3 :: disp3()
{
cout<<”\t”<<policy<<”\t”<<address;
}
void derived :: get()
{
base1 :: get1();
base2 :: get2();
base3 :: get3();
present=1;
cout<<”\nEnter telephone number: “;
cin>>telephone;
cout<<”\nEnter liscence number: “;
cin>>liscence;
}
void derived :: disp()
{
base1::disp1();
base2::disp2();
base3::disp3();
cout<<”\t”<<telephone<<”\t”<<liscence<<”\t”;
}
void main()
{
derived obj[50],temp;
int ch,i,j=-1,no,flag=0;
char key[10],ans;
clrscr();
do
{
cout<<”\n\tMenu”
<<”\n1.Build Master Table”
<<”\n2.Display”
<<”\n3.Insert a new entry”
<<”\n4.Delete entry”
<<”\n5.Edit”
<<”\n6.Search for record”
<<”\n7.Exit”
<<”\nEnter your choice: “;
cin>>ch;
switch(ch)
{
case 1:
do
{
j++;
obj[j].get();
cout<<”\nAdd another…..(y/n)?: “;
cin>>ans;
}while(ans==’Y’ || ans==’y');
break;
case 2: cout<<”\nName\tDOB\tB.G.\tHeight\tWeight\tPolicy\tAddres\tTeleNo\tLiscNo “;
cout<<”\n———————————————————————–”;
for(i=0;i<=j;i++)
obj[i].disp();
break;
case 3:
cout<<”\n Enter the index no.: “;
cin>>no;
if(no<=j)
{
for(i=no;i<=j;i++)
{
temp=obj[i];
obj[i+1]=temp;
}
obj[no].get();
j++;
cout<<”\nRecord Inserted Successfully…..”;
}
else
cout<<”\nERROR…..”;
break;
case 4:
if(j!=-1)
{
cout<<”\nEnter the record no. to delete: “;
cin>>no;
if(no<=j)
{
for(i=no;i<=j;i++)
{
temp=obj[i];
obj[i]=obj[i+1];
}
j–;
cout<<”\nRecord Deleted SuccessFully…..”;
}
else
cout<<”\nERROR…..”;
}
else
cout<<”\nNo Record to delete…..”;
break;
case 5:
if(j!=-1)
{
cout<<”\nEnter index no.”;
cin>>no;
cout<<”\nEnter modified data: “;
obj[no].get();
cout<<”\nRecord modified Successfully…..”;
}
else
cout<<”\nNo Record to modify…..”;
break;
case 6:
if(j!=-1)
{
cout<<”Enter the name to be searched:” ;
cin>>key;
for(i=0;i<=j;i++)
{
if(strcmp(obj[i].name,key)==0)
{
cout<<”\nRecord Found…..”;
obj[i].disp();
flag=1;
}
}
if(flag==0)
cout<<”\nRecord not found…..”;
}
else
cout<<”\nNo Record to search…..”;
break;
case 7:
exit(0);
default:
cout<<”\nInvalid Choice…..”;
}
}while(ch!=7);
getch();
}