#include<stdlib.h>
#include<iostream.h>
#include<fstream.h>
#include<string.h>
#include<conio.h>
class stud
{
	char id[10],name[10],sem[10],buf[53];
	public:void read();
	void pack();
	void unpack();
	void del();
	void search();
	void search_dis();
}s;
fstream f1,f2,f3;
void stud::read()
{
	cout<<"enter ID,Name,Sem\n";
	cin>>id>>name>>sem;
}
void stud::pack()
{
	char x[10]={'0'};
	int len,pad=0;
	f1.open("rec2.txt",ios::app);
	strcpy(buf,id);
	strcat(buf,"|");
	strcat(buf,name);
	strcat(buf,"|");
	strcat(buf,sem);
	len=strlen(buf);
	pad=50-len;
	for(int i=0;buf[i]!='\0';i++)
	f1.put(buf[i]);
	while(pad>0)
	{
		f1.put(' ');
		pad--;
	}
	f1.close();
	f1.open("rec2.txt",ios::in);
	while(1)
	{
		f1.getline(buf,51);
		if(f1.eof())
		break;
		int y=atoi(x);
		y++;
		itoa(y,x,10);
	}
	f1.close();
	f2.open("ind2.txt",ios::app);
	f2<<id<<"|"<<x<<"#";
	f2.close();
	f3.open("sind2.txt",ios::app);
	f3<<name<<"|"<<id<<"#";
	f3.close();
}
void stud::unpack()
{
	cout<<"ID\tName\tsem\n";
	f1.open("rec2.txt",ios::in);
	while(1)
	{
		if(f1.eof())
		break;
		loop:f1.getline(buf,51);
		if(buf[0]=='$')
		goto loop;
		for(int i=0;buf[i]!='\0';i++)
		{
			if(buf[i]=='|')
			cout<<"\t";
			else if(buf[i]==' ');
			else
			cout<<buf[i];
		}
		cout<<"\n";
	}
	f1.close();
}
void stud::del()
{
	char id1[10],tempid[10],nm[10];
	char x[10]={' '};
	cout<<"enter the name of the stud to be deleted\n";
	cin>>name;
	int pos[10],y,j;
	y=j=0;
	f3.open("sind2.txt",ios::in|ios::out);
	while(1)
	{
		if(f3.eof())
		break;
		loop:f3.getline(buf,51,'#');
		if(buf[0]=='$')
		goto loop;
		for(int i=0;buf[i]!='|';i++)
		nm[i]=buf[i];
		nm[i++]='\0';
		if(strcmp(nm,name)==0)
		{
			j=0;
			pos[y++]=(f3.tellg()-strlen(buf))-1;
			for(;buf[i]!='\0';i++)
			id1[j++]=buf[i];
			id1[j]='\0';
			cout<<"id"<<y<<"="<<id1<<endl;
		}
	}
	if(y==1)
	{
		f3.seekp(pos[y-1],ios::beg);
		f3.put('$');
		f2.open("ind2.txt",ios::in|ios::out);
		while(1)
		{
			if(f2.eof())
			break;
			loop1:f2.getline(buf,51,'#');
			if(buf[0]=='$')
			goto loop1;
			for(int i=0;buf[i]!='|';i++)
			tempid[i]=buf[i];
			tempid[i++]='\0';
			if(strcmp(id1,tempid)==0)
			{
				int len=strlen(buf);
				len++;
				cout<<"record deleted\n";
				f2.seekp(-len,ios::cur);
				f2.put('$');
				int y=0;
				for(;buf[i]!='\0';i++)
				x[y++]=buf[i];
				x[y]='\0';
				y=atoi(x);
				y--;
				y=(y*50);
				f1.open("rec2.txt",ios::in|ios::out);
				f1.seekp(y,ios::beg);
				f1.put('$');
				f1.close();
				f2.close();
				f3.close();
				break;
			}
		}
	}
	else if(y>1)
	{
		cout<<"select the ID and ID No,respectively,of the person to be deleted from the above list\n";
		cin>>id1>>j;
		f3.seekp(pos[j-1],ios::beg);
		f3.put('$');
		f2.open("ind2.txt",ios::in|ios::out);
		while(1)
		{
			if(f2.eof())
			break;
			loop2:f2.getline(buf,51,'#');
			if(buf[0]=='$')
			goto loop2;
			for(int i=0;buf[i]!='|';i++)
			tempid[i]=buf[i];
			tempid[i++]='\0';
			if(strcmp(id1,tempid)==0)
			{
				int len=strlen(buf);
				len++;
				cout<<"recod deleted\n";
				f2.seekp(-len,ios::cur);
				f2.put('$');
				int y=0;
				for(;buf[i]!='\0';i++)
				x[y++]=buf[i];
				x[y]='\0';
				y=atoi(x);
				y--;
				y=(y*50);
				f1.open("rec2.txt",ios::in|ios::out);
				f1.seekp(y,ios::beg);
				f1.put('$');
				f3.close();
				f1.close();
				f2.close();
				break;
			}
		}
	}
	else
	cout<<"record not found\n";
	}

void stud::search()
{
	char id1[10],tempid[10],nm[10];
	cout<<"enter the name of the stud to be searched\n";
	cin>>name;
	int pos[10],y,j;
	y=j=0;
	f3.open("sind2.txt",ios::in|ios::out);
	while(1)
	{
		if(f3.eof())
		break;
		loop:f3.getline(buf,51,'#');
		if(buf[0]=='$')
		goto loop;
		for(int i=0;buf[i]!='|';i++)
		nm[i]=buf[i];
		nm[i++]='\0';
		if(strcmp(nm,name)==0)
		{
			y++;
			j=0;
			for(;buf[i]!='\0';i++)
			id[j++]=buf[i];
			id[j]='\0';
			cout<<"id"<<y<<"="<<id<<endl;
		}
	}
	f3.close();
	if(y==1)
	{
		search_dis();
	}
	else if(y>1)
	{
		cout<<"select the ID of the person to be deleted from the above list\n";
		cin>>id;
		search_dis();
	}
	else
	{
		cout<<"record not found\n";
	}
	}

void stud::search_dis()
{
	char tempid[10],x[10];
	f2.open("ind2.txt",ios::in|ios::out);
	while(1)
	{
		if(f2.eof())
		{
			cout<<"record not found\n";
			break;
		}
		loop:f2.getline(buf,51,'#');
		if(buf[0]=='$')
		goto loop;
		for(int i=0;buf[i]!='|';i++)
		tempid[i]=buf[i];
		tempid[i++]='\0';
		if(strcmp(id,tempid)==0)
		{
			cout<<"record found\n";
			int y=0;
			for(;buf[i]!='\0';i++)
			x[y++]=buf[i];
			x[y]='\0';
			y=atoi(x);
			y--;
			y=(y*50);
			f1.open("rec2.txt",ios::in);
			f1.seekg(y,ios::beg);
			f1.getline(buf,51);
			cout<<"Details:\n";
			for(i=0;buf[i]!='\0';i++)
			if(buf[i]=='|')
			cout<<"\t";
			else if(buf[i]==' ');
			else
			cout<<buf[i];
			cout<<"\n";
			break;
		}
	}
	f2.close();
	f1.close();
}
void main()
{
	clrscr();
	while(1)
	{
		cout<<"\t\tMenu:\n\n"<<"1.Insert\n2.Display\n3.search\n4.delete\n5.exit\n";
		cout<<"enter you choice\n";
		int ch;
		cin>>ch;
		switch(ch)
		{
			case 1:s.read();
			s.pack();
			break;
			case 2:s.unpack();
			break;
			case 3:s.search();
			break;
			case 4:s.del();
			break;
			case 5:exit(0);
		}
	}
}