Q.Create a class student with data members name,class,section,roll no. and function
members getdata(),printdata(),and promoted().From this class derive a class 'Sr_std'
with additional data member stream.Also include another function member change_stream().

#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<string.h>
char ch[5];
class Student
{
    private:
    char name[30];
    int cla;
    char section[2];
    int roll_no;
    public:
    Student()
    {
     strcpy(name,"ABCD");
     cla=1;
     strcpy(section,"A");
     roll_no=1;
    }
    void getdata()
    {
     cout<<"Enter name:";
     gets(name);
     cout<<endl<<"Enter class:";
     cin>>cla;
     cout<<"Enter section:";
     cin>>section;
     cout<<"Enter roll number:";
     cin>>roll_no;
    }
    void print()
    {
     cout<<endl<<"Name:";
     puts(name);
     cout<<endl<<"Class:";
     cout<<cla;
     cout<<endl<<"Section:";
     cout<<section;
     cout<<endl<<"Roll number:";
     cout<<roll_no;
    }
    protected:
    void promote()
    {
     cout<<"Congratulation!!! Promoted to:"<<cla+1;
     cla=cla+1;
    }
};
class Sr_std:public Student
{
    private:
    char stream[5];
    public:
    Sr_std()
    {
     strcpy(stream,"PCM");
    }
    void getdata()
    {
     Student::getdata();
     cout<<"Enter stream:";
     gets(stream);
    }
    void print()
    {
     Student::print();
     cout<<endl<<"Stream:"<<stream;
    }
    void change_stream()
    {
     cout<<"Enter desired stream:";
     gets(ch);
     strcpy(stream,ch);
    }
    void promote()
    {
     Student::promote();
    }
};
void main()
{
    clrscr();
    char str;
    Sr_std A;
    A.getdata();

    cout<<endl<<"Want to change stream:(Y/N)";
    cin>>ch;
    if(strcmp(ch,"Y")==0)
    {
    A.change_stream();
    A.print();
    }
    else
    A.print();
    int marks;
    cout<<endl<<"Enter % marks obtained:";
    cin>>marks;
    if(marks>40)
    A.promote();
    else
    cout<<"Fail!!!!";
    getch();
}