overwrite text file data?

[student 123]

Can someone tell me how do I overwrite the first data on the text file? What function do I have to use? I have tried to use the ios::beg but there was an error with it.. Why can I not do like this?

are.open("student_data.txt",ios::beg);

[ModShop]

are.open("student_data.txt", ios::trunc);
This should work.

[ultifinitus]

If you simply open it and don't call the ios::app flag, the data will be overwritten.

file.open("file.ext",ios::out);

[student 123]

Correct me if I am wrong, ios::trunc and ios::out will delete all the data in the text file. Is it?

I am sorry for not being clear in here. I only want to overwrite the first data in the text file without altering other data.
(What I mean data here is a list of data)

[ultifinitus]

Waaaait so you want to simply put data in, and override the data that is currently in that position, but leave the rest completely unaffected?

[student 123]

Basically that is the idea. By the way, I find a way to overwrite the first data,

are.open("student_data.txt",ios::in);
are.seekp(0,ios::beg); //overwrite only the beginning of the list (1st data)



Then the second problem is I need to figure out how to overwrite the second data on the list without affecting the rest of the data again. Any idea how? I am trying to do the 'for' loop, but I don't think it make sense.