Practical12_IndexSequentialFile.cpp

#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;

class Emp
{
  int empid;
char name[20];
char design[20];
float salary;
   public: 
Emp()
{
empid=0;
strcpy(name,“”);
strcpy(design,"");
salary=0.0;
}
int acceptempid()
{
return(empid);
}
void getdata()
{
cout<<"\nEnter Emp details:";
cout<<"\nEnter emp id:";
cin>>empid;
cout<<"Enter emp name : ";
cin>>name;
cout<<"Enter Designation : ";
cin>>design;
cout<<"Enter salary: ";
cin>>salary;
}
void display()
{
cout<<"\n Emp Details";
cout<<"\n Emp id = "<<empid;
cout<<"\n Emp Name = "<<name;
cout<<"\n Designation = "<<design;
cout<<"\n Salary = "<<salary;
}
};
class fileop
{
ifstream fin;
ofstream fout;
fstream fs;
public:
void insert();
void show();
void search(int);
int deleterecord(int);
int append(int);
};
void fileop::insert()
{
Emp obj;
obj.getdata();
fout.open("data.txt",ios::ate|ios::app);
fout.write((char*)&obj,sizeof(obj));
fout.close();
}
void fileop::show()
{
Emp obj;
fin.open("data.txt");
fin.seekg(0,ios::beg);
while(fin.read((char*)&obj,sizeof(obj)))
{
obj.display();
}
fin.close();
}
void fileop::search(int rno)
{
Emp obj;
int flag=0;
fin.open("data.txt");
fin.seekg(0,ios::beg);
while(fin.read((char*)&obj,sizeof(obj)))
{
if(obj. acceptempid()==rno)
{
flag=1;
break;
}
}
fin.close();
if(flag==1)
{
cout<<"\n Emp found";
obj.display();
}
else
{
cout<<"\n Emp not found";
}
}
int fileop::deleterecord(int rno)
{
Emp obj;
int flag=0;
fin.open("data.txt");
fin.seekg(0,ios::beg);
while(fin.read((char*)&obj,sizeof(obj)))
{
if(obj. acceptempid()==rno)
{
flag=1;
}
else
{
fout.write((char*)&obj,sizeof(obj));
}
}
fin.close();
fout.close();
remove("data.txt");
rename("temp.txt","data.txt");
return(flag);
 }
 int fileop::append(int rno)
{
Emp obj;
int flag=0;
fs.open("data.txt");
fs.seekg(0,ios::beg);
while(fs.read((char*)&obj,sizeof(obj)))
{
if(obj. acceptempid()==rno)
{
flag=1;
cout<<"\n Enter new details: ";
obj.getdata();
fs.seekp((int)fs.tellg()-sizeof(obj),ios::beg);
fs.write((char*)&obj,sizeof(obj));
}
}
fs.close();
return(flag);
}
 
      
int main()
{
   fileop fobj;
    char ch='y';
    int choice,key, n;
    do{
        cout<<"\n Main Menu";
        cout<<"\n 1. Create";
        cout<<"\n 2. Display";
        cout<<"\n 3. Search";
        cout<<"\n 4. Delete";
        cout<<"\n 5. Append";
        cout<<"\n 6. Exit";
        cout<<"\n Enter your choice:";
        cin>>choice;
        switch(choice)
        {
            case 1: fobj.insert();
            break;
            case 2: fobj.show();
            break;
            case 3: 
             cout<<"\n Enter emp id to search : ";
              cin>>n;
              fobj.search(n);
            break;
            case 4: 
              cout<<"\n Enter emp id to delete : ";
              cin>>n;
              fobj.deleterecord(n);
            break;
            case 5: 
               cout<<"\n Enter emp id to edit : ";
              cin>>n;
              fobj.append(n);
            break;
            case 6: exit(0);
        }
    cout<<"\n Do you want to continue:";
    cin>>ch;
            }while(ch=='y');
    return 0;
}