clear data inside text file in c

Question

I am programming on C    In my code I create a text file  write data to the file and reading from the file using stream  after I finish the sequence I desire I wish to clear all the data inside the txt file  Can someone tell me the command to clear the data in the txt file  Thank you

User · Answer

If you simply open the file for writing with the truncate-option, you'll delete the content.

std::ofstream ofs;
ofs.open("test.txt", std::ofstream::out | std::ofstream::trunc);
ofs.close();

http://www.cplusplus.com/reference/fstream/ofstream/open/

User · Answer

As far as I am aware  simply opening the file in write mode without append mode will erase the contents of the file   ofstream file  filename txt       Without append ofstream file  filename txt   ios  app      with append   The first one will place the position bit at the beginning erasing all contents while the second version will place the position bit at the end-of-file bit and write from there

User · Answer

Deleting the file will also remove the content  See remove file

User · Answer

If you set the trunc flag    include lt fstream gt   using namespace std   fstream ofs   int main    ofs open  test txt   ios  out   ios  trunc   ofs lt  lt  Your content here   ofs close      Using microsoft incremental linker version 14     I tested this thouroughly for my own needs in a common programming situation I had  Definitely be sure to preform the   close     operation  If you don t do this there is no telling whether or not you you trunc or just app to the begging of the file  Depending on the file type you might just append over the file which depending on your needs may not fullfill its purpose  Be sure to call   close     explicity on the fstream you are trying to replace

[c++] clear data inside text file in c++

Examples related to c++

Examples related to fstream