note Eliya <blockquote> <i> It works fine for the first line in file1 </i> </blockquote> <p> The problem is that once you've read through the files 2 and 3, their file pointers will be at end of file (EOF), so further reads in subsequent iterations of the outer loop return nothing. </p> <p> One solution would be to repeatedly [doc://seek] to the beginning of the files.&nbsp; Another solution would be to read the contents of file 2 and 3 into arrays. </p> 973787 973787