•
RETurn
is
used
to
force a function
or
procedure
to
terminate and resume processing
at
the statement
after
the procedure
or
function
call.
When used
within
a function definition
theRETurn statement
is
used
to
return the function's
value.
RETurn
functions and
procedures
syntax:
example:
•
RETurn [expression]
100
PRINT
ack
(3,3)
110
DEFine
FuNction
ack(m,n)
120
IF
m=O
THEN
RETurn
n+1
130
IF
n=O
THEN
RETurn
ack
(m-1,ll
140 RETurn
ack(m-1,ack(m,n-1»
150
END
DEFine
ii.
10
LET
warning
flag
= 1
11
LET
error
number =
RND(O
TO
10J
12
warning
e-;ror
number
13 DEFine PROCedure
warning(n)
14
IF
warning
flag
THEN
15 PRINT "WARNING:";
16 SELect
ON
n
17
ON
n = 1
18
PRINT
"Microdrive
full"
19
ON
n =2
20
PRINT
"Data
space
full"
21
ON
n =
REMAINDER
22
PRINT
"Program
error
ll
23
END
SELect
24
ELSE
25
RETurn
26
END
IF
27
END
DEF
i ne
It
is
not compulsory
to
have
a RETurn
in
a procedure.
If
processing reaches the END comment
DEFine
of
a procedure then the procedure
will
return automatically.
RETurn by
Itself
is
used
to
return
from
a GOSUB.
RND
maths functions
PRINT RND(10
TO
20)
PRINT
RND(1
TO
6)
PRINT RND(10)
ii.
iii.
iv.
RND generates a random number. Up
to
two
parameters may be specified for RND.
If
no parameters
are
specified
then
RND returns a pseudo random floating pomt number
in
the exclusive range 0
to
1.
If
a single parameter
is
specified then RND returns
an
integer
in
the Inclusive range 0
to
the specified parameter
If
twc
parameters
are
specified
then RND returns
an
integer
in
the inclusive range specified by the two parameters.
syntax: RND (
[numenc_expresslon] [10 numenc_expressionj)
example: PRINT
RND
[ftoating
pOint
number between
o and
11
[integer between
10
and
201
(integer between 1 and
61
[integer between °and
101
•
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49
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