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12
Getting Started
The next three steps in program creation are each satisfied with BASIC-executable statements.
Creation of a storage area for the object code for the program (which can be estimated at less
than 40 words; there is essentially one word of object code per line of source) is accomplished
by programming the statement -
(The ICOM statement is fully discussed in the "Setting Aside Memory" section of this chapter.)
This can be followed in the same program by an instruction to assemble the source code into
object code -
290
IASSEMBlE Multipl ication
(The IASSEMBLE statement is fully discussed in Chapter 4.)
If the assembly is successful (and
it
will be in this example), then the routine can be called and
used as desired. A typical call looks like -
600
IeAll
Multiply(Ind~x,Dim8~sion,Subscript)
t5
:i.IJ
fir,··t-·.::t.::}
(~:::; i.At)S.C r"~
f)t )
::=i '
/:::i.ll)!::;'
(The ICALL statement is fully discussed in Chapter 6.)
Thus, the final result could easily be -
10
40
::;;OUF:CE
:;:;O!...iF:CE
60
:::;OUFCE
70
' ; ;;;Oi...iF.:CE
C:~L:i
::;OUF.:CE
'30
:;:;OUPCE
1
~.:iU
::;OU
F.:CE
120
::::;OUFCE
13(~
::::;OUFCE
i 40
~:;CIL1F~C:E
15~:'i
::;OUPCE
NAM Multipl
ica~ion
!
B~ginning
ot module
E::·::T Er-'
(·C)r-~_.E:·>::
i t
~
C;E't
=.).:-:a.
1
i ..
~E·,
I
i'-it
~::'!;~E'
i'-·::::.:
1::::;::;
~~
~:;t
()r-'.3,!;;iE' .:i.r-·E',3. f'Cir-'
i
r-j1:. E'i;!E'r-':=;. C
f-'e'·3,
t
E'ci
Inpw.1:
Ir·H
I
r-if:!t~t
2:
I
r'~1'
Ciijt
~==t~t
:
I
r·~-r
L.DA
=Int~';ie(·:::.+l
Indicates Efitry point follows
1 .....
3.1 ue of the i nput.
p3.r··.3.met.er-·~::.
from BASIC and st.oring
t.hE~
where
t.he rout.ine can use t.hem
arit.hmet.ic accumulat.or and
finally mult.ipl ies t.hem
A check for
overflc~
is performed
and t.he routine is
a~~rted
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