Sandeep Hegde

File Structure ( FS ) Lab Program 5 ( 6th Semester Information Science)

// April 9th, 2009 // Educational, Engineering, File Structure (F.S.) Lab // Written by sandeephegdecloseAuthor: sandeephegde Name: Sandeep Hegde
Email: sandeephegde88@gmail.com
Site: http://www.sandeephegde.me
About: See Authors Posts (119)

#include<iostream.h>
#include<string.h>
#include<fstream.h>
#include<stdlib.h>
#include<conio.h>

class record
{
public: char age[5],sem[5];
char usn[20], name[20], branch[5];
} rec[20];

char st_no[5];
int no;

void retrieve_details()
{
fstream file2;
char name[20],usn[20],branch[5];
char age[5],sem[5],ind[5];

file2.open(“record.txt”,ios::in);
for(int i=0;i<no;i++)
{
file2.getline(ind,5,’|');
file2.getline(usn,20,’|');
file2.getline(name,20,’|');
file2.getline(age,5,’|');
file2.getline(sem,5,’|');
file2.getline(branch,5,’\n’);
if(strcmp(ind,st_no)==0)
{
cout<<”\n\n”<<”Student details: “;
cout<<”\n USN\t\tNAME\t\tAGE\t\tSEM\t\tBRANCH\n”;
cout<<”\n”<<usn<<”\t\t”<<name<<”\t\t”<<age<<”\t\t”<<sem<<”\t\t”<<branch<<”\n”;
}
}
file2.close();
}

void delete_record(char usno[])
{
int i;
fstream file1,file2;
char age[5],sem[5],name[20],usn[20],branch[5],ind[5];
file2.open(“record.txt”,ios::in);
for(i=0;i<no;i++)
{
file2.getline(ind,5,’|');
file2.getline(usn,20,’|');
file2.getline(name,20,’|');
file2.getline(age,5,’|');
file2.getline(sem,5,’|');
file2.getline(branch,5,’\n’);
strcpy(rec[i].usn,usn);
strcpy(rec[i].name,name);
strcpy(rec[i].age,age);
strcpy(rec[i].sem,sem);
strcpy(rec[i].branch,branch);
}
int flag=-1;
for(i=0;i<no;i++)
{
if(strcmp(rec[i].usn,usno)==0)
flag=i;
}
if(flag==-1)
{
cout<<”Error!!!\n”;
return;
}
if(flag==(no-1))
{
no–;
cout<<”Deleted!!!\n”;
return;
}
for(i=flag;i<no;i++)
{
rec[i]=rec[i+1];
}
no–;
cout<<”Deleted!!!\n”;
file2.close();

file1.open(“index.txt”,ios::out);
file2.open(“record.txt”,ios::out);
for(i=0;i<no;i++)
{
file1<<rec[i].usn<<”|”<<i<<”\n”;
file2<<i<<”|”<<rec[i].usn<<”|”<<rec[i].name<<”|”<<rec[i].age<<”|”<<rec[i].sem<<”|”<<rec[i].branch<<”\n”;
}
file1.close();
file2.close();
return;
}

int main()
{
fstream file1,file2;
clrscr();
int ch,i,flag,flag1;
char rt_usn[20],st_usn[20];
char ind[5],name[20],age[5],sem[5],branch[5];
file1.open(“index.txt”,ios::out);
file2.open(“record.txt”,ios::out);
if(!file1||!file2)
{
cout<<”File creation Error!\n”;
exit(0);
}

for(;;)
{
cout<<”Enter your choice: \n 1. Add Record\n 2. Search Record\n 3.Delete Record\n 4.Display record\n”;
cin>>ch;
switch(ch)
{
case 1:cout<<”Enter the no. of students\n”;
cin>>no;
cout<<”Enter the details :\n”;
for(i=0;i<no;i++)
{
cout<<”\n Name :”;
cin>>rec[i].name;
cout<<”\n Age :”;
cin>>rec[i].age;
cout<<”\n USN :”;
cin>>rec[i].usn;
cout<<”\n Semester :”;
cin>>rec[i].sem;
cout<<”\n Branch :”;
cin>>rec[i].branch;
file1<<rec[i].usn<<”|”<<i<<”\n”;
file2<<i<<”|”<<rec[i].usn<<”|”<<rec[i].name<<”|”<<rec[i].age<<”|”<<rec[i].sem<<”|”<<rec[i].branch<<”\n”;
}
file1.close();
file2.close();
break;

case 2: cout<<” Enter the usn of the student whose record is to be displayed\n”;
cin>>st_usn;
file1.open(“index.txt”,ios::in);
if(!file1)
{
cout<<”Error !!!\n”;
exit(0);
}
flag1=0;
for(i=0;i<no;i++)
{
file1.getline(rt_usn,20,’|');
file1.getline(st_no,5,’\n’);
if(strcmp(st_usn,rt_usn)==0)
{
retrieve_details();
flag1=1;
}
}
if(!flag1)
cout<<”Record not found\n”;
file1.close();
break;
case 3: cout<<” Enter the USN of the student whose record is to be deleted\n”;
cin>>st_usn;
file1.open(“index.txt”,ios::in);
if(!file1)
{
cout<<”Error!!!\n”;
exit(0);
}
flag=0;
for(i=0;i<no;i++)
{
file1.getline(rt_usn,20,’|');
file1.getline(st_no,5,’\n’);
if(strcmp(st_usn,rt_usn)==0)
{
delete_record(rt_usn);
flag=1;
}
}
if(!flag)

cout<<”Deletion failed\n”;
file1.close();
break;

case 4: cout<<”Student Details :\n\n”;
cout<<”\n USN\t\tNAME\t\tAGE\t\tSEM\t\tBRANCH\n”;
for(i=0;i<no;i++)
{
cout<<”\n”<<rec[i].usn<<”\t\t”<<rec[i].name<<”\t\t”<<rec[i].age<<”\t\t”<<rec[i].sem<<”\t\t”<<rec[i].branch<<”\n”;
}
break;
default: cout<<”Invalid Choice!!!!!\n”;
exit(0);
break;
}
}
}

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