Is_Complex_Float - Texas Instruments TI-89 Developer's Manual

Appendix A: System Routines — EStack Arithmetic

is_complex_Float

Declaration: Boolean is_complex_Float (IndexConstQuantum i )
Category(ies): EStack Arithmetic
Description: Determines whether the expression indexed by i is a complex float.
Inputs: i
Outputs: Returns TRUE if i indexes a FLOAT_TAG or an IM_RE_TAG on top of two
expressions having float tags. Otherwise returns FALSE.
i indexes the top tag of an expression.
Assumptions:
Side Effects: None
On AMS 2.02 and higher.
Availability:
TI-89 / TI-92 Plus
Differences: None
See Also: is_complex_number
Examples:
Boolean is_cFloat_agg (EStackIndex i)
/* Returns TRUE if the expression indexed by i contains only floats
and/or complex floats. Otherwise returns FALSE. */
{ return is_complex_Float(i) ||
LIST_TAG == ESTACK(i) && all_tail (&is_cFloat_agg, i-1u);
}
TI-89 / TI-92 Plus Developer Guide
— Index to an expression.
Not for Distribution
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Beta Version January 26, 2001