Student Database in C Language 

Accept student information (e.g. Roll No, Name, Percentage etc.).

• Display the data in descending order of Percentage (Bubble Sort).
• Display data for Roll No specified by user (Linear Search).
• Display the number of passes and comparisons for different test cases (Worst,
• Average, Best case).

Student Database in C Language  Code

 #include  
 #include  
 #include  
 #include  
 class A  
 {  
   protected:  
   char blood[4],name[20];  
   int date,month,year;  
   public:  
   void inputa()  
   {  
     cout<<"ENTER NAME";  
     gets(name);  
     cout<<"ENTER DATE OF BIRTH";  
     cin>>date>>month>>year;  
     cout<<"ENTER BLODD GROUP!!";  
     gets(blood);  
   }  
   virtual void display()  
   {  
     cout<<"\nNAME:"<<name; <br="">     cout<<"\nDATE OF BIRTH:"<<date<<" "<<month<<"="" "<<year;="" <br="">     cout<<"\nBLOOD GROUP:"<<blood; <br="">     getch();  
   }  
 };  
 class B:virtual public A  
 {  
   protected:  
   int height;  
   int weight;  
   public:  
   void inputb()  
   {  
     cout<<"ENTER HEIGHT";  
     cin>>height;  
     cout<<"ENTER weight";  
     cin>>weight;  
   }  
   virtual void display()  
   {  
     cout<<"\nheight :"<<height; <br="">     cout<<"\nweight:"<<weight; <br="">     getch();  
   }  
 };  
 class C:virtual public A  
 {  
   protected:  
   int hno ;  
   char city[10];  
   unsigned long int insno;  
   public:  
   void inputc()  
   {  
     cout<<"ENTER ADDRESS OF CARD HOLDER";  
     cout<<"HOUSE NO";  
     cin>>hno;  
     cout<<"CITY";  
     cin>>city;  
     cout<<"ENTER INSURANCE NO";  
     cin>>insno;  
   }  
   virtual void display()  
   {  
     cout<<"\nADDRESS OF CARD HOLDER:"<<hno<<" "<<city;="" <br="">     cout<<"\nINSURANCE NO OF CARD HOLDER:"<<insno; <br="">     getch();  
   }  
 };  
 class D:public B,public C  
 {  
   int licno;  
   unsigned long int teleno;  
   public:  
   int id;  
   D()  
   {  
     id=0;  
     strcpy(name,'\0');  
     date=0;  
     month=0;  
     year=0;  
     height=0 ;  
     weight=0;  
     strcpy(blood,'\0');  
     hno=0;  
     strcpy(city,'\0');  
     insno=0;  
     teleno=0;  
     licno=0;  
   }  
   D(D &  d)  
   {  
     id=d.id;  
     strcpy(name,d.name);  
     date=d.date;  
     month=d.month;  
     year=d.year;  
     height=d.height;  
     weight=d.weight;  
     strcpy(blood,d.blood);  
     hno=d.hno;  
     strcpy(city,d.city);  
     insno=d.insno;  
     teleno=d.teleno;  
     licno=d.licno;  
   }  
   void inputd()  
   {  
     cout<<"ENTER TELEPHONE NO AFTER FIRST DIGIT ";  
     cin>>teleno;  
     cout<<"ENTER LICENCE NO";  
     cin>>licno;  
   }  
   void display()  
   {  
     clrscr();  
     cout<<"\nID NO"<<id; <br="">     cout<<"\nNAME:"<<name; <br="">     cout<<"\nDATE OF BIRTH:"<<date<<" "<<month<<"="" "<<year;="" <br="">     cout<<"\nHEIGHT:"<<height; <br="">     cout<<"\nWEIGHT:"<<weight; <br="">     cout<<"\ncBLOOD GROUP"<<blood; <br="">     cout<<"\nADDRESS:"<<hno<<" "<<city;="" <br="">     cout<<"\nINSURANCE NO:"<<insno; <br="">     cout<<"\nPHONE NO:"<<"9"<<teleno; <br="">     cout<<"\nLICENCE NO:"<<licno; <br="">     getch();  
   }  
 };  
 void main()  
 {  
   D d[20];  
   int ch=0,i=0,j;  
   do  
   {  
     clrscr();  
     cout<<"\t\t\t\t1.BUILD A MASTER TABLE\n" ;  
     cout<<"\t\t\t\t2.DISPLAY THE ENTRIES\n" ;  
     cout<<"\t\t\t\t3.INSERT A NEW DATA\n";  
     cout<<"\t\t\t\t4.DELETE A DATA\n" ;  
     cout<<"\t\t\t\t5.SEARCH FOR SPECIFIC ENTRY\n";  
     cout<<"\t\t\t\t6.EXIT\n" ;  
     cout<<"\t\t\t\tENTER UR CHOICE";  
     cin>>ch;  
     switch(ch)  
     {  
       case 1:  
         cout<<"\n\t\tBUILD A RECORD FOR CREDIT CARD!!";  
         i=0;  
         do  
         {  
           d[i].id=i+1;  
           d[i].inputa();  
           d[i].inputb();  
           d[i].inputc();  
           d[i].inputd();  
       i++;  
           cout<<"WANT TO ENTER MORE DATA";  
         }while(getche()=='y');  
         break;  
       case 2:  
         cout<<"\n\t\tDISPLAY CREDIT CARD RECORD!!";  
         for(j=0;j<i;j++) <br="">         {  
           d[j].display();  
         }  
         break;  
       case 3:  
         cout<<"\n\t\tINSERT A NEW RECORD IN CREDIT CARD ENTRY!!";  
         int k=i;  
         for(j=0;j<i;j++) <br="">           if(d[j].id!=j+1)  
           {  
             k=j;  
             while(j<i) <br="">               d[j+1]=d[j++];  
             break;  
           }  
         d[k].id=k+1;  
         d[k].inputa();  
         d[k].inputb();  
         d[k].inputc();  
         d[k].inputd();  
         i++;  
         break;  
       case 4:  
         cout<<"\n\t\tDELETE A CREDIT CARD RECORD \n\t\tENTER ID";  
         cin>>k;  
         for(j=0;j<i;j++) <br="">           if(d[j].id==k)  
           {  
             while(j<(i-1))  
              {  
               d[j]=d[j+1];  
               break;  
              }  
           }  
           i--;  
         break;  
       case 5:  
         cout<<"\n\t\tSEARCH FOR SPECIFIC ENTRY\n\t\tENTER ID";  
         cin>>k;  
         for(j=0;j<i;j++) <br="">           if(d[j].id==k)  
             break;  
         if(j!=i)  
         {  
             d[j].display();  
         }  
         else  
           cout<<"SORRY RECORD NOT FOUND";  
         getch();  
         break;  
       case 6:  
         break;  
     }  
   }while(ch!=6);  
   getch();  
 }