Home » Ask & Discuss » Board Exams - CBSE, ICSE, State Boards » Computer Science « Back to Discussion

Computer Science

Blazing goIITian

Joined:	31 Jan 2007
Post:	515

29 Mar 2008 20:41:28 IST

0 People liked this

644

file handling!!!!!!!!rates assured!!!!!

None

in certain Q they ask the missing statement:

eg;consider a class book having a func modify()

void modify(book new)

{fstream file;

file .open("book.dat",ios::in|ios::out);

book ob;

int rr=0,f=0;

while(!file)

{file.read(char* &ob,sizeof (ob));

rr++;

if(new.bno()==ob.bno())

{

_______________________

file.write(char* &new,sizeof (new));

f=1}

}

can d missing statement be: file.seekp(sizeof(ob));

or file.seekp(file.tellg());

plz reply soon

rates assured

!!!!!!!!!!!!!!!!!!!!

Share this article on:

Comments (3)

sneha.bagri

Blazing goIITian

Joined: 5 Jan 2007

Posts: 378

29 Mar 2008 21:50:14 IST

Like 1 people liked this

no it cant b because file.seekp(sizeof(ob)) will take u to d end of d first record and always d second record will get modified

and file.seekp(file.tellg()) will keep u at d place where u are

varsha valli g.

Blazing goIITian

Joined: 31 Jan 2007

Posts: 515

29 Mar 2008 22:44:30 IST

Like 0 people liked this

s thats what i want bcoz when u want to modify a particular record then u have to go to the record by using the bno.
am i right
!!!!!!!!!!!

sneha.bagri

Blazing goIITian

Joined: 5 Jan 2007

Posts: 378

29 Mar 2008 22:59:44 IST

Like 1 people liked this

u can use seekp(-sizeof(ob),ios::cur)

Quick Reply

Reply

	Some HTML allowed.
	Keep your comments above the belt or risk having them deleted.
	Signup for a avatar to have your pictures show up by your comment
	If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team