Push_Float_To_Nonneg_Int - Texas Instruments TI-89 Developer's Manual

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Appendix A: System Routines — Direct Floating Point Operations

push_Float_to_nonneg_int

Declaration: void push_Float_to_nonneg_int (Float f )
Category(ies): Direct Floating Point Operations
Description: If the truncated integer part of f is representable as a big integer, that
tagged integer value is pushed onto the estack.
f — Non-negative C floating-point number.
Inputs:
Outputs: None
Assumptions: None
Side Effects: Throws RATIONAL_NUMERIC_OVERFLOW_ERROR if the truncated
integer part of f is not representable as a big integer.
Availability: On AMS 1.05 and higher.
TI-89 / TI-92 Plus
Differences: None
See Also: push_Float
Examples:
Boolean did_push_cnvrt_Float_to_integer (EStackIndex i)
/* i indexes a tagged float.
If it is a whole number that is representable as an integer, pushes the
integer equivalent then returns TRUE.
Otherwise returns FALSE. */
{ Float f;
f = ESTACK_TO_FLOAT (i);
if (FLOAT0 == FMOD (f, FLOAT1))
{ Float abs_f = fabs (f);
if (FLOAT_TO_NON_OVERFLOW_THRESHOLD > abs_f)
{ push_Float_to_nonneg_int (abs_f);
if (f < FLOAT0)
negate_top()
return TRUE;
}
}
return FALSE;
}
TI-89 / TI-92 Plus Developer Guide Not for Distribution Beta Version January 26, 2001