How can i write something to file at the end of the file in c++

i'm writing something to file and it writes it in the middle of the file开发者_如何学运维, is there any function that writes output to the end of the file? thanx in advance. ok this is really wierd i'm running with the visual studio debugger and i see that it writes thing to file like this : A B C D which is good, and than when i'm writing something for example E it writes it here A B E C D this is really wierd, how can i fix it?

If you use std::ofstream and open the file in append mode (using std::ios_base::app in the mode mask) then all writes will be made at the end of the file.

With the plain old C functions, open the file with O_APPEND or call lseek(fd, 0, SEEK_END) before writing.

With ofstream, call file.seekp(0, ios_base::end) before writing.