CSCI E-92: Application Note 3

Using formatted input and output stdio functions (including printf, snprintf,
-----------------------------------------------------------------------------
    scanf, sscanf) with 64-bit (i.e., long long) or floating-point values
    ---------------------------------------------------------------------

Using default project settings, it is to not be possible to print out
the value of a 64-bit variable (such as one declared as a uint64_t or
long long int) or any floating point variables using printf.

Because of this issue, for "long long" variables a workaround is to
print out the high-order 32-bits and then the low-order 32-bits
separately.  You'll have to do some operations in your head after you
see the printed values in order to recreate the value of the 64-bt
value.

So, for example, if the variable you want to print is declared as

    uint64_t val;

You could derive just the high-order 32-bits via

    val>>32

And you could derive just the low-order 32-bits via

    val&0xffffffff

Those two 32-bit values could be printed out via printf as either
hexadecimal or decimal numbers.

At the expense of having a larger code (text) segment for your
project, you can change the project settings as follows to support
formatted output of "long long" (i.e., 64-bit integers).  In
CodeWarrior, open Project -> Properties.  On the left of the
Properties window, select "C/C++ Build" -> "Settings."  In the
"Settings" pane on the right, select "Librarian."  To the right, the
"Print formats" can be changed from "int" -- which is the default --
to "int_LL" -- for int and "long long" support for formatted output.

Similarly, the options for "Print formats" can be changed to allow
formatted output of floating point numbers.

All the "Print formats" options are:
  int			no support for "long long" or floating-point
  int_FP		Floating-point is supported
  int_LL		"long long" is supported
  int_LL_FP		Both "long long" and floating-point are supported

The same options are available to allow formatted input of "long long"
or floating-point numbers under the "Scan formats" menu.