DSA/sequential.cpp at main · SiddhantHargude/DSA · GitHub

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

class student
{
	public:
	char name[10];
	int roll;
		void getdata()
		{
			cout<<"\n Enter the roll no and name:";
			cin>>roll>>name;
		}

		void putdata()
		{
			cout<<"\n The roll no and name:";
			cout<<roll<<"    "<<name;
		}

};
class file
{
	fstream fp;
	public:
		void create()
		{
			char ans;
			student s;
			fp.open("stu.dat",ios::out);
			do
			{
				s.getdata();
				fp.write((char *)&s,sizeof(s));
				cout<<"\n More?";
				cin>>ans;
			}while(ans=='Y'||ans=='y');
			fp.close();
		}
                void append()
		{
			char ans;
			student s;
			fp.open("stu.dat",ios::app);
			do
			{
				s.getdata();
				fp.write((char *)&s,sizeof(s));
				cout<<"\n More?";
				cin>>ans;
			}while(ans=='Y'||ans=='y');
			fp.close();
		}
		void display()
		{
			student s;
			fp.open("stu.dat",ios::in);
			while(!fp.eof())
			{
				fp.read((char *)&s,sizeof(s));
				if (!fp.eof())
					s.putdata();
			}
			fp.close();
		}
                void search()
		{
			student s; int flag=0;
                        int r;
                        cout <<"\n Enter roll to be searched:";
                        cin >> r;
			fp.open("stu.dat",ios::in);
			while(!fp.eof())
			{
				fp.read((char *)&s,sizeof(s));
				if (!fp.eof() && s.roll==r)
                                {  flag=1;  s.putdata(); break;    }
			}
                        if (flag==0)  cout << "\n Not found";
			fp.close();
		}
		void update()
		{
			student s; int flag=0;
                       int r;
                        cout <<"\n Enter roll to be updated:";
                        cin >> r;
			fp.open("stu.dat",ios::in|ios::out);
			while(!fp.eof())
			{
				fp.read((char *)&s,sizeof(s));
				if (!fp.eof() && s.roll==r)
                                {
                                  flag=1;
                                  cout <<"\n Enter new data\n";
                                  s.getdata();
                                  fp.seekp(-1*sizeof(s),ios::cur);
                                  fp.write((char *)&s,sizeof(s));
                                  break;
                                }
			}

                        if (flag==0)  cout << "\n Not found";
			fp.close();
		}
		void delete1()
		{
			student s; int flag=0;
			fstream fp1;
                        cout <<"\n Enter roll to be deleted:";
                        int r;  cin >> r;
			fp.open("stu.dat",ios::in);
			fp1.open("temp.dat",ios::out);
			while(fp.read((char *)&s,sizeof(s)))
			{

				if ( s.roll!=r)
                        {
                        	flag=1;
				   	fp1.write((char *)&s,sizeof(s));
                        }
			}
                        if (flag==0)  cout << "\n Not found";
			fp.close();
			fp1.close();
			remove("stu.dat");
			rename("temp.dat","stu.dat");
		}
};
int main()
{
	file f; int choice;
        do{cout<<"\n";
           cout << "\n1.Create \n2.Display \n3.Search \n4.Append  \n5.Delete \n6.Update";
           cout << "\n Enter choice:";  cin >> choice;
	   cout<<"\n";
           switch(choice)
           {
               case 1:f.create(); break;
               case 2:f.display(); break;
               case 3:f.search(); break;
               case 4:f.append(); break;
	       case 5:f.delete1();break;
	       case 6:f.update();break;
           }
       }while(choice< 7);
}