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102
Arithmetic
By way of example, suppose you have established two full-precision values which need to be
multiplied. The call to the Rei_math utility to accomplish the multiplication would look similar
to this-
ISOURCE Multiply:
j
MULTIF~Y
~~E
OPERANDS
I
~:;Cii..JFCE
LDn
I '::;Ot.!F'CE
T:::;OUF:CE
I::::;OUi?CE
I ' : :;:Oi..H' ; U::E
L..I)A
-;:~:~
Test
for
any
errors
F~r'('ctr~
~.:>r1cCii)i·-itE·t···~:·c1!1
:::,:::
11:;·.~.!.)!:::·
Note in the last line of the example the call to the Error_exit utility (page 191) is made when
register A is not zero. When this occurs, A contains the error number of the error
encountered - ready-made for calling the Error_exit utility.
UTILITY:
Rei to int
The Rei_to _int utility provides for the conversion of a full-precision value into an integer.
General Procedure: The utility is given the address of the location of th.e full-precision value
and the address of the location where the integer is to be stored.
Special Requirements: The full-precision value must be within the range of integers
(- 32 768 to
+
32 767).
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