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The following table shows the possible forms
of
the
function
header:
Number
of
Format
of
Header
Arguments
Type
No
Explicit
Result
Explicit
Result
0 Niladac
VNAME
VR+-NAME
1 Monadic
VNAME
B V R+-NAME B
2 Dyadic
VA
NAME B V R+-A NAME B
There must
be
a blank between the function name and the arguments. Also, the
same
symbol cannot appear more than once in the function header; thus,
Z+-FUNCTION Z
is
invalid.
For user-defined functions, the order in which the arguments
are
entered
is
important. For example,
assume
that
Z+-X
DIVIDE
Y represents a function in
which Z
is
the result
of
Xf
Y.
Now
if
20
DIVIDE
10
is
entered, the result
is
2.
However,
if
10
DIVIDE
20
is
entered, the result
is
0.5.
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