Hybrid Inheritance Example Program in C++ to Calculate the Marks and Percentage of a Student

Hybrid Inheritance is the combination of two or more inheritances : single, multiple,multilevel or hierarchical Inheritances. The following is a C++ Program to for Calculating the marks secured by a student.A Parent class with student identification is created and another class called marks is inherited from the main class.This class marks is further inherited by another class called sports and finally the sports class is inherited by the percentage class to calculated the percentage of marks.This is the best example for Hybrid Inheritance in c++The complete source code is provided Below 

 #include<iostream.h>  
 #include<conio.h>  
 #include<stdio.h>  
 #include<string.h>  
 class student_id  
 {  
 //c-madeeasy.blogspot.com  
 int rno;  
 char name[20];  
 public:  
 void read_id()  
 {  
 cout<<"\n\nEnter the Name of the Student : ";  
 gets(name);  
 cout<<"\n\nEnter the Roll No. : ";  
 cin>>rno;  
 }  
 void display_nr()  
 {  
 cout<<"\n\n\t\tSTUDENT REPORT\n\nNAME : ";  
 puts(name);  
 cout<<"\n\nROLL NO. : "<<rno;  
 }  
 };  
 class marks:public student_id  
 {  
 public:  
 int i,mark[3];  
 void read_m()  
 {  
 read_id();  
 for(i=0;i<3;i++)  
 {  
 cout<<"\n\nEnter the Marks Secured in SUBJECT "<<i+1<<" out of 100 : ";  
 cin>>mark[i];  
 }  
 }  
 void display_m()  
 {  
 display_nr();  
 cout<<"\n\n\tMarks Secured ";  
 for(i=0;i<3;i++)  
 cout<<"\n\nSUBJECT "<<i+1<<" : "<<mark[i];  
 }  
 };  
 class sports  
 {  
 public:  
 int sm;  
 void read_sportm()  
 {  
 cout<<"\n\nEnter the marks in SPORTS out of 10 : ";  
 cin>>sm;  
 }  
 };  
 class percentage:public marks,public sports  
 {  
 public:  
 float total,prcntge;  
 void calculate()  
 {  
 read_m();  
 read_sportm();  
 total=0;  
 for(i=0;i<3;i++)  
 {  
 total+=mark[i];  
 }  
 total+=sm;  
 prcntge=(total/310)*100;  
 }  
 void display_totp()  
 {  
 display_m();  
 cout<<"\n\nTOTAL = "<<total;  
 cout<<"\n\nPERCENTAGE = "<<prcntge;  
 }  
 };  
 void main()  
 {  
 int cont;  
 percentage pc;  
 clrscr();  
 do  
 {  
 pc.calculate();  
 clrscr();  
 pc.display_totp();  
 cout<<"\n\nDo You Want to Continue?(1-YES/0-NO)";  
 cin>>cont;  
 }while(cont==1);  
 getch();  
 }