Slip 11 - B) Create a base class Student with data members Roll_No, Name. Derives two classes from it, class Theory with data members M1, M2, M3, M4 and class Practical with data members P1, P2. Class Result(Total_Marks, Percentage, Grade) inherits both Theory and Practical classes. (Use concept of Virtual Base Class and protected access specifiers) Write a C++ menudriven programto perform the following functions: i. Accept Student Information ii. Display Student Information iii. Calculate Total_marks, Percentage and Grade.

 Solution:

 #include<conio.h>

#include<string.h>

#include<conio.h>

#include<iostream.h>

class student

{

protected:

int  rno;

char name[20];

public:

void getdetails();

};

 class Theory:public virtual student

{

protected:

int mark1,mark2,mark3,mark4;

public:

void getmarks();

};

 class Practical :virtual public student

{

protected:

int p1,p2;

public:

void getpractical();

};

 class result :public Theory,public Practical

{

int total_marks;

float per;

char grade[10];

public:

void calc();

void sort(result& ,result&);

void display();

};

 void student::getdetails()

{

cout<<"\n enter roll no and name  :";

cin>>rno>>name;

}

 void Theory::getmarks()

{

cout<<"\n enter marks of four subject :";

cin >>mark1>>mark2>>mark3>>mark4;

}

 void Practical::getpractical()

{

cout<<"\n enter  Practical Details  :";

cin>>p1>>p2;

}

 void result::calc()

{

int i;

total_marks=mark1+mark2+mark3+mark4+p1+p2;

per=total_marks/(float)6;

if(per<50)

strcpy(grade,"C");

else

if(per<60)

strcpy(grade,"B");

else

if(per<75)

strcpy(grade,"A");

else

strcpy(grade,"A+");

cout<<"\n calculation complete\n";

}

 void result::sort(result &r1,result &r2)

{

result rt;

if(r1.total_marks>r2.total_marks)

{

rt=r1;

r1=r2;

r2=rt;

}

}

 void result::display()

{

cout<<"\n roll no="<<rno<<"\n name ="<<name;

cout<<"\n mark1="<<mark1<<"\n mark2 ="<<mark2<<"\n mark3="<<mark3<<"\n mark4="<<mark4;

cout<<"\n Practical P1="<<p1<<"\n Practical P2="<<p2<<"\n percentage ="<<per<<"\n grade ="<<grade;

}

 int main()

{

int n,i,ch,j;

result r[20];

clrscr();

do

{

cout<<"\n MENU \n";

cout<<"\n 1.build master table \n 2. calculate total & grade \n";

cout<<"\n 3.display result in asscending order \n enter your choice :  ";

cin>>ch;

switch(ch)

{

case 1:

cout<<"\n how many student :";

cin>>n;

for(i=0;i<n;i++)

{

cout<<"enter student detailse \n";

r[i].getdetails();

r[i].getmarks();

r[i].getpractical();

}

break;

 case 2:

for(i=0;i<n;i++)

r[i].calc();

break;

 case 3:

for(i=0;i<n;i++)

{

for(j=i+1;j<n;j++)

r[i].sort(r[i],r[j]);

r[i].display();

}

break;

 }

}while(ch<=3);

getch();

return 0;

}