Appendix A: System Routines — EStack Arithmetic
477
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
is_complex_number
Declaration:
Boolean
is_complex_number
(IndexConstQuantum
i
)
Category(ies):
EStack Arithmetic
Description:
Determines whether
i
indexes a complex number.
Inputs:
i
— Index of an expression.
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.
Assumptions:
i
indexes the top tag of an expression.
Side Effects:
None
Availability:
On AMS 1.05 and higher.
TI
-
89 / TI
-
92 Plus
Differences:
None
See Also: is_complex_float
Examples:
push_Float (3.7);
is_complex_number (top_estack); /* Returns TRUE */
real_part = top_estack;
push_quantum_as_nonnegative_int (5u);
replace_top2_with_imre (real_part);
is_complex_number (top_estack); /* Returns TRUE */
push_quantum (PI_TAG);
is_complex_number (top_estack); /* Returns FALSE */
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