Thread: 1L and casting

Originally Posted by whiteflags

Code:

fseek(ifp, -1L * sizeof(Person), SEEK_CUR);

is this:

Code:

unsigned int a = 5;
printf("%d\n", 1L * a);

the same as:

Code:

unsigned int a = 5;
printf("%d\n", (long)a);

Is there a difference between 1L and a cast? I realize that the reason it is used in the fseek above is that sizeof returns an unsigned int.

And be careful, both of those printf() statements are incorrect. Remember that the format specifier must match the variable type, in this case you're trying to print a long as an int.

Also I intended for the number to be negative because I wanted fseek() to move backwards. sizeof is never a negative number of bytes.