Comments on: File Structure ( FS ) Lab Program 4 ( 6th Semester Information Science)

By: sandeephegde

sandeephegde — Fri, 19 Jun 2009 13:03:11 +0000

Thank you

By: sandeephegde

sandeephegde — Fri, 19 Jun 2009 13:03:00 +0000

Thank you

By: sandeephegde

sandeephegde — Fri, 19 Jun 2009 13:03:00 +0000

Thank you

By: shaardula

shaardula — Thu, 18 Jun 2009 13:08:49 +0000

There’s no question of intelligence here.it’s the question of correctness.IF you do a program which is simple but not even for what was asked you get no marks.Any way see the program below to believe -i am not telling some bluff ok..(and for the link you have given it’s not working..
)the below prog does both jobs -has variable length and also gives RRN access.even has sample o/p.

#include
#include
#include
#include
#include
#include

int count;
class variable
{
struct student
{ char usn[20],name[20],sem[20],dept[20];
};
public: void pack();
void unpack();
};

void variable::pack()
{ char b[100],c[20];
student s;
cout<>s.usn>>s.name>>s.sem>>s.dept;
ofstream ofile;
ofile.open(“student3.txt”,ios::app);
ofile.seekp(0,ios::end);
long p=ofile.tellp();
sprintf(c,”|%d|%ld|$”,count+1,p);
sprintf(b,”|%s|%s|%s|%s|$”,s.usn,s.name,s.sem,s.dept);
count++;
ofile< ofstream rr;
rr.open(“rr.txt”,ios::app);
rr< rr.close();
ofile.close();
}

void variable::unpack()
{ char b[100],temp[100],c[20],t[50];
student s;
int rrn,frrn,n=0,flag=0;
long pos;
cout<>rrn;
ifstream rr;
rr.open(“rr.txt”,ios::out);
rr.seekg(0,ios::beg);
ifstream ifile;
ifile.open(“student3.txt”,ios::out);
ifile.seekg(0,ios::beg);
while(n<=count)
{
rr.getline(c,20,’$');
sscanf(c,”|%d|%ld|$”,&frrn,&pos,t);
if(rrn==frrn)
{ flag=1;
ifile.seekg(pos,ios::beg);
cout<<”\nDatabase: \n”;
ifile.getline(b,100,’$');
sscanf(b,”|%[^|]|%[^|]|%[^|]|%[^|]|$”,s.usn,s.name,s.sem,s.dept,temp);
cout< break;
}
n++;
}
if(flag==0) cout<<”\nKey not found”;
rr.close();
ifile.close();
}

void main()
{
variable f;
clrscr();
printf(“\nPROGRAM TO RETRIEVE RECORDS USING RRN\n”);
char buffer[100];
ifstream ifile;
ifile.open(“student3.txt”,ios::out);
ifile.seekg(0,ios::beg);
while(!ifile.eof())
{ ifile.getline(buffer,100,’$');
count++;
}
count–;
ifile.close();
int ch;
for(;;)
{ cout<>ch;
switch(ch)
{ case 1: f.pack();
break;
case 2: f.unpack();
break;
default: exit(0);

}
}
}

/* OUTPUT

PROGRAM TO RETRIEVE RECORDS USING RRN
1: pack 2: unpack 3:Exit
Enter your choice: 1

Enter usn, name, sem, dept: 12 ram 4 is

1: pack 2: unpack 3:Exit
Enter your choice: 1

Enter usn, name, sem, dept: 23 sam 4 cse

1: pack 2: unpack 3:Exit
Enter your choice: 1

Enter usn, name, sem, dept: 1 ali 6 iem

1: pack 2: unpack 3:Exit
Enter your choice: 2

Enter record no: 3

Database:
1 ali 6 iem

1: pack 2: unpack 3:Exit
Enter your choice: 2

Enter record no: 1

Database:
12 ram 4 is

1: pack 2: unpack 3:Exit
Enter your choice: 3

By: shaardula

shaardula — Thu, 18 Jun 2009 13:08:00 +0000

#include
#include
#include
#include
#include
#include

int count;
class variable
{
struct student
{ char usn[20],name[20],sem[20],dept[20];
};
public: void pack();
void unpack();
};

void variable::unpack()
{ char b[100],temp[100],c[20],t[50];
student s;
int rrn,frrn,n=0,flag=0;
long pos;
cout<>rrn;
ifstream rr;
rr.open(“rr.txt”,ios::out);
rr.seekg(0,ios::beg);
ifstream ifile;
ifile.open(“student3.txt”,ios::out);
ifile.seekg(0,ios::beg);
while(n<=count)
{
rr.getline(c,20,’$');
sscanf(c,”|%d|%ld|$”,&frrn,&pos,t);
if(rrn==frrn)
{ flag=1;
ifile.seekg(pos,ios::beg);
cout<<”nDatabase: n”;
ifile.getline(b,100,’$');
sscanf(b,”|%[^|]|%[^|]|%[^|]|%[^|]|$”,s.usn,s.name,s.sem,s.dept,temp);
cout< break;
}
n++;
}
if(flag==0) cout<<”nKey not found”;
rr.close();
ifile.close();
}

void main()
{
variable f;
clrscr();
printf(“nPROGRAM TO RETRIEVE RECORDS USING RRNn”);
char buffer[100];
ifstream ifile;
ifile.open(“student3.txt”,ios::out);
ifile.seekg(0,ios::beg);
while(!ifile.eof())
{ ifile.getline(buffer,100,’$');
count++;
}
count–;
ifile.close();
int ch;
for(;;)
{ cout<>ch;
switch(ch)
{ case 1: f.pack();
break;
case 2: f.unpack();
break;
default: exit(0);

}
}
}

/* OUTPUT

PROGRAM TO RETRIEVE RECORDS USING RRN
1: pack 2: unpack 3:Exit
Enter your choice: 1

Enter usn, name, sem, dept: 12 ram 4 is

1: pack 2: unpack 3:Exit
Enter your choice: 1

Enter usn, name, sem, dept: 23 sam 4 cse

1: pack 2: unpack 3:Exit
Enter your choice: 1

Enter usn, name, sem, dept: 1 ali 6 iem

1: pack 2: unpack 3:Exit
Enter your choice: 2

Enter record no: 3

Database:
1 ali 6 iem

1: pack 2: unpack 3:Exit
Enter your choice: 2

Enter record no: 1

Database:
12 ram 4 is

1: pack 2: unpack 3:Exit
Enter your choice: 3