Scheme_Object *
scheme_abs(int argc, Scheme_Object *argv[])
{
Scheme_Type t;
Scheme_Object *o;
o = argv[0];
if (SCHEME_INTP(o)) {
intptr_t n = SCHEME_INT_VAL(o);
return scheme_make_integer_value(ABS(n));
}
t = _SCHEME_TYPE(o);
#ifdef MZ_USE_SINGLE_FLOATS
if (t == scheme_float_type)
return scheme_make_float(fabs(SCHEME_FLT_VAL(o)));
#endif
if (t == scheme_double_type)
return scheme_make_double(fabs(SCHEME_DBL_VAL(o)));
if (t == scheme_bignum_type) {
if (SCHEME_BIGPOS(o))
return o;
return scheme_bignum_negate(o);
}
if (t == scheme_rational_type) {
if (scheme_is_rational_positive(o))
return o;
else
return scheme_rational_negate(o);
}
NEED_REAL(abs);
ESCAPED_BEFORE_HERE;
}
Scheme_Object *scheme_rational_subtract(const Scheme_Object *a, const Scheme_Object *b)
{
return scheme_rational_add(a, scheme_rational_negate(b));
}