DragonFly On-Line Manual Pages

ftofix(3)                       Allegro manual                       ftofix(3)

NAME
       ftofix - Converts a floating point value to fixed point. Allegro game
       programming library.

SYNOPSIS
       #include <allegro.h>

       fixed ftofix(double x);

DESCRIPTION
       Converts a floating point value to fixed point. Unlike itofix(), this
       function clamps values which could overflow the type conversion,
       setting `errno' to ERANGE in the process if this happens. Example:

          fixed number;
          number = itofix(-40000);
          ASSERT(fixfloor(number) == -32768);
          number = itofix(64000);
          ASSERT(fixfloor(number) == 32767);
          ASSERT(!errno); /* This will fail. */

RETURN VALUE
       Returns the value of the floating point value converted to fixed point
       clamping overflows (and setting `errno').

SEE ALSO
       fixtof(3), itofix(3), fixtoi(3), exfixed(3), exrotscl(3), exspline(3),
       exupdate(3)

Allegro                          version 4.4.2                       ftofix(3)