Texas Instruments TI89 Developer Guide - Page 565
result, estack_to_short
UPC - 033317198566
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Appendix A: System Routines - EStack Utilities 523 estack_to_ushort Declaration: short estack_to_ushort (EStackIndex i, unsigned short * result) Category(ies): EStack Utilities, EStack Arithmetic Description: Converts a tagged whole number to a C unsigned short. Inputs: i - Index of the tag of a tagged integer or tagged float whole number. result - Points to an unsigned short for return value. Outputs: If successful, returns 1 and unsigned short via result. If the argument is a valid type, but too large for unsigned short, returns 0 and stores 65535 in result. If the argument is invalid, returns L1 and stores 0 in result. Assumptions: None Side Effects: None Availability: On AMS 1.05 and higher. TI-89 / TI-92 Plus Differences: None See Also: estack_to_short Example: void push_char (EStackIndex i) /* i indexes a tagged whole number from 0 through 255 or an aggregate thereof. Pushes the corresponding string or aggregate thereof, except char(0 unsigned short c; if (IS_NUMBER_TAG(ESTACK(i)) && is_whole_number(i) && 1 == estack_to_ushort(i, &c) && c < 256 ) { push_quantum (0); if (c) push_quantum ((Quantum) c); push_quantum (0u); push_quantum (STR_DATA_TAG); } else if (LIST_TAG == ESTACK(i)) { map_tail (push_char, i-1); push_quantum (LIST_TAG); } else ER_THROW (ER_DOMAIN); } TI-89 / TI-92 Plus Developer Guide Not for Distribution Beta Version January 26, 2001