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#include 

#include 

int main(int argc, char **argv)

{

  int i;

  char c;

  FILE *f;

  FILE *fin;

  FILE *fout;

  //write to file

  f=fopen("testfile.txt","w");

  for(i=0;i<50;i++)

  {

        fputc('1',f);

  }

  fclose(f);

  //append to file

  f=fopen("testfile.txt","a");

  for(i=0;i<50;i++)

  {

        fputc('2',f);

  }

  fclose(f);

  //copy from testfile.txt to copyfile.txt

  fin=fopen("testfile.txt","r");

  fout=fopen("copyfile.txt","w");

  while((c=fgetc(fin))!=EOF)

  {

        fputc(c,fout);

  }

  fclose(fin);

  fclose(fout);

}