c++ - Writing to specific position in a file -

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i have

fstream output; output.open(fname, ios::out | ios::trunc); //file (int i=0; i<flength; i++)     output.put('1');

i want overwrite different length of data different locations in file. data characters.

lets there 111111111111111111111111111111111, want write 

11   111111333111!!!!!!1    11441111

use seekp() set writing position in file stream.


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