Is_Complex_Number - Texas Instruments TI-89 Developer's Manual

Appendix A: System Routines — EStack Arithmetic

is_complex_number

Declaration: Boolean is_complex_number (IndexConstQuantum i )
Category(ies): EStack Arithmetic
Description: Determines whether i indexes a complex number.
Inputs: i
Outputs: Returns TRUE if i indexes a numeric tag or an IM_RE_TAG on top of two
expressions having numeric tags. Otherwise returns FALSE.
i indexes the top tag of an expression.
Assumptions:
Side Effects: None
On AMS 1.05 and higher.
Availability:
TI-89 / TI-92 Plus
Differences: None
See Also: is_complex_float
Examples:
push_Float (3.7);
is_complex_number (top_estack);
real_part = top_estack;
push_quantum_as_nonnegative_int (5u);
replace_top2_with_imre (real_part);
is_complex_number (top_estack);
push_quantum (PI_TAG);
is_complex_number (top_estack);
TI-89 / TI-92 Plus Developer Guide
— Index of an expression.
/* Returns TRUE */
/* Returns TRUE */
/* Returns FALSE */
Not for Distribution
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Beta Version January 26, 2001