How to append text to a text file in C

Question

How to append text to a text file in C    And create a new text file if it does not already exist and append text to it if it does exist

User · Answer

include  lt fstream gt    include  lt iostream gt    FILE   pFileTXT   int counter  int main      pFileTXT   fopen   aTextFile txt   a      use  a  for append   w  to overwrite  previous content will be deleted   for counter 0 counter lt 9 counter     fprintf  pFileTXT    c   characterarray counter       character array to file   fprintf pFileTXT   n      newline   for counter 0 counter lt 9 counter     fprintf  pFileTXT    d   digitarray counter           numerical to file   fprintf pFileTXT  A Sentence                         String to file   fprintf  pFileXML    2x  character                   Printing hex value  0x31 if character  1   fclose  pFileTXT      must close after opening   return 0

User · Answer

You need to specify the append open mode like   include  lt fstream gt   int main         std  ofstream outfile     outfile open  test txt   std  ios base  app      append instead of overwrite   outfile  lt  lt   Data      return 0

User · Answer

You could also do it like this   include  lt fstream gt   int main       std  ofstream ost  outputfile  std  ios base  app    ost open outputfile   ost  lt  lt   something you want to add to your outputfile   ost close    return 0

User · Answer

You could use an fstream and open it with the std  ios  app flag  Have a look at the code below and it should clear your head        fstream f  filename ext   f out   f app   f  lt  lt   any   f  lt  lt   text   f  lt  lt   written   f  lt  lt   wll   f  lt  lt   be append         You can find more information about the open modes here and about fstreams here

User · Answer

I use this code  It makes sure that file gets created if it doesn t exist and also adds bit of error checks   static void appendLineToFile string filepath  string line        std  ofstream file        can t enable exception now because of gcc bug that raises ios base  failure with useless message       file exceptions file exceptions     std  ios  failbit       file open filepath  std  ios  out   std  ios  app       if  file fail            throw std  ios base  failure std  strerror errno           make sure write fails with exception if something is wrong     file exceptions file exceptions     std  ios  failbit   std  ifstream  badbit        file  lt  lt  line  lt  lt  std  endl

User · Answer

I got my code for the answer from a book called  C   Programming In Easy Steps   The could below should work    include  lt fstream gt   include  lt string gt   include  lt iostream gt   using namespace std   int main         ofstream writer  filename file-extension    ios  app        if   writer                cout  lt  lt   Error Opening File   lt  lt  endl          return -1             string info    insert text here       writer append info        writer  lt  lt  info  lt  lt  endl      writer close      return 0          I hope this helps you

[c++] How to append text to a text file in C++?

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