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ftofix.3alleg

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(3alleg), itofix(3alleg), fixtoi(3alleg), exfixed(3alleg), exspline(3alleg), exupdate(3alleg)