File write in C confusion

Question

Hi I am appending at the bottom of the text file this works on windows but on linux instead of appending to the bottom it appends to the top of the text file. The code i am using is. The code must only use C

FILE *fout;
fout = fopen("dat.txt","a");  
fprintf(fout,"&& ");
fclose(fout);

Please help. Thank you

Answer 1

Check for errors returned from those system calls - that code looks correct. Also, check to make sure you aren't accidentally mangling dat.txt elsewhere in your code.

Answer 2

I compiled on Mac OS (Linux) and it works as advertised, e.g. the line was appended at the end.

Are you doing something else with the file?

Answer 3

This should be ok. check your code again, maybe you are repostioning the file pointer, with frewind or fseek somewhere. A better way is to use the "a+" option. You should also check the return value fout from fopen.

Answer 4

If you do anything else with that file before the append, make sure you are closing it.