the program of c++ using more than one class

Bismillahir Rahmanir Rahim
 Now I'm writing a program to use class.if you have to face any problem any problem comment below. 
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solution:
//iubatians.blogspot.com
#include<iostream.h>
class io
{
  public:
void input_part()
{
cout<<"Enter your data:"<<endl<<"_________________________"<<endl;
}
void output_part()
{
cout<<endl<<"Disply your input:"<<endl<<"Name\t\tId"<<endl<<"________________________"<<endl;
}
};
class rajib
{
char nr[30];
unsigned long int idr;
 public:
void get()
{
cout<<"Enter name:";
cin>>nr;
cout<<"Enter your id:";
cin>>idr;
}
void disply()
{
cout<<"1."<<nr<<"\t\t"<<idr<<endl;
}

};
class tanjid
{
char nt[30];
unsigned long int idt;
 public:
void get()
{
cout<<"Enter name:";
cin>>nt;
cout<<"Enter your id:";
cin>>idt;
}
void disply()
{
cout<<"2."<<nt<<"\t\t"<<idt<<endl;
}
};
class sojib
{
char ns[30];
unsigned long int ids;
 public:
void get()
{
cout<<"Enter name:";
cin>>ns;
cout<<"Enter your id:";
cin>>ids;
}
void disply()
{
cout<<"3."<<ns<<"\t\t"<<ids<<endl;
}
};
void main()
{
io p;
rajib r;
tanjid t;
sojib s;
p.input_part();
r.get();
t.get();
s.get();
p.output_part();
r.disply();
t.disply();
s.disply();

}

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