I use :x most often. That way, if the file never really changed, :x will just exit because there is no changes in the buffer. Whereas, :wq will write the buffer regardless if changes were made, altering the timestamp of the file. I'm anal when it comes to file timestamps.

char string[20] = "aman"; Will allocate an char array with a size of 21 (the extra one, is for the null terminator), giving you [a][m][a][n][0][0][0][0][0]...[0] Whereas: char string[] = "aman"; Will allocate an char array with a size of 5 (again, extra one, is for the null terminator), giving you [a][m][a][n][0]