Estack_Number_To_Float - Texas Instruments TI-89 Developer's Manual

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Appendix A: System Routines — Direct Floating Point Operations

estack_number_to_Float

Declaration: Float estack_number_to_Float (IndexConstQuantum i )
Category(ies): Direct Floating Point Operations, EStack Utilities
Description: Returns the floating-point representation of i .
Inputs: i
Outputs: Floating-point representation of i .
Assumptions: i points to the tag of a tagged number.
Side Effects: None
Availability: On AMS 1.05 and higher.
TI-89 / TI-92 Plus
None
Differences:
See Also: estack_to_float
Example:
Boolean sum_has_small_numeric_term (EStackIndex i, Float tolerance)
/* i indexes a sum.
Returns TRUE if it does not have a top-level numeric term or if its
magnitude is < tolerance.
*/
{ i = index_numeric_term (i);
return NULL_INDEX == i ||
fabs (estack_number_to_Float (i)) <= tolerance;
}
TI-89 / TI-92 Plus Developer Guide
— Index of a tagged number.
Not for Distribution Beta Version January 26, 2001