Assignment 13: File Handling - Binary File

Question 1	Assuming the class EMPLOYEE given below, write functions in C++ to perform following: (i) Write the objects of EMPLOYEE to a binary file. (ii) Read the objects of EMPLOYEE from binary file and display them on screen. class EMPLOYEE {             int ENO;             char ENAME[10];             public :             void GETIT()             {                         cin >> ENO;                         gets (ENAME);             }             void SHOWIT()            {                         cout <<ENO << ENAME <<endl;             } };
Question 2	Assuming the class Computer as follows : class computer {             char chiptype[10];             int speed;             public:                         void getdetails()                         {                                     gets(chiptype);                                     cin>>speed;                         }                         void showdetails()                         {                                     cout<<“Chip”<<chiptype<<“ Speed= “<<speed;                         } }; Write a function readfile( ) to read all the records present in an already existing binary file SHIP.DAT and display them on the screen, also count the number of records present in the file.
Question 3	Given a binary file STUDENT.DAT, containing records of the following class Student type class Student {             char S_Admno[lO];    //Admission number of student             char S_Name[30];       //Name of student             int Percentage;            //Marks Percentage of student             public:                         void EnterData()                         {                                     gets(S_Admno);                                     gets(S_Name);                                     cin>>Percentage;                         }                         void DisplayData()                         {                                     cout<<setw(12)<<S_Admno;                                     cout<<setw(32)<<S_Name;                                    cout<<setw(3)<<Percentage<<endl;                         }                         int ReturnPercentage()                         {return Percentage;} }; Write a function in C++, that would read contents of file STUDENT.DAT and display the details of those Students whose Percentage is above 75.
Question 4	Observe the program segment given below carefully and fill the blanks marked as Statement 1 and Statement 2 using seekg() and tellg() functions for performing the required task. #include <fstream.h> class Employee {             int Eno;             char Ename[20];             public:             //Function to count the total number of records             int Countrec(); }; int Item::Countrec() {             fstream File;             File.open("EMP.DAT",ios::binary|ios::in);             ______________________ //Statement 1             int Bytes =______________________ //Statement 2             int Count = Bytes / sizeof(Item);             File.close();             return Count; }
Question 5	Write a function in C++ to add new objects at the bottom of a binary file "STUDENT.DAT", assuming the binary file is containing the objects of the following class. class STUD {             int Rno;             char Name[20];             public:             void Enter()             {cin>>Rno;gets(Name);}             void Display()             {cout<<Rno<<Name<<endl;} };
Question 6	Observe the program segment given below carefully and fill the blanks marked as Statement 1 and Statement 2 using seekp() and seekg() functions for performing the required task. #include <fstream.h> class Item {             int Ino;             char Item[20];             public:             //Function to search and display the content from a particular record number              void Search(int );            //Function to modify the content of a particular record number             void Modify(int);  };  void Item::Search(int RecNo) {             fstream File;             File.open(“STOCK.DAT”,ios::binary|ios::in);             ______________________ //Statement 1             File.read((char*)this,sizeof(Item));             cout<<Ino<<”==>”<<Item<<endl;             File.close(); } void Item::Modify(int RecNo) {             fstream File;             File.open(“STOCK.DAT”,ios::binary|ios::in|ios::out);             cout>>Ino;             cin.getline(Item,20);             ______________________ //Statement 2             File.write((char*)this,sizeof(Item));             File.close(); }