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HARSFEN0602
Consider some examples using system commands.
Example Explanation
a = AC This expression assigns value of the system command AC to the variable ‘a’.
This expression is valid if the AC command is allowed to ‘get value’, i.e. it has PreProcess flag
AC = a This expression assigns value of the variable ‘a’ to the system command AC.
This expression is valid if the AC command is allowed to ‘set value’, i.e. it has PostProcess flag
BG This is executable command. It cannot be assigned, i.e. it has neither PreProcess nor PostProcess
nor Assign flags
For example, the following expressions
BG = 1
or
a = BG
are not legal
LS This expression is not legal, because it uses command that has NotProgram flag. The
‘NotProgram’ commands are not allowed in user program, while they are available for the
Interpreter language.
5.3.6.5 Built-in Function Calls
The description and syntax is the same as in the Interpreter Language. See Built-in function call of the
Interpreter Language
5.3.6.6 User Function Calls
Functions perform a pre-written and compiled code. Functions get a list of arguments from their caller, and
return a list of return values.
Functions get their list of input argument by value – they do not directly modify them.
The general syntax of a function call is
[OUT1,OUT2,…OUTN]=FUNC(IN1,IN2,…IN_N)
If only one value is returned, the square parentheses are not required and the syntax is following:
OUT=FUNC(IN_1,…,IN_N)
Not all the output variables need be assigned.
For example, if the function FUNC returns two values,
[IA[1],IA[2]]=FUNC()
assigns the two returned values to IA[1] and IA[2].
IA[1]=FUNC()
Returns the first return value to IA[1], and the other returned values remain unused.
If the returned value has another type than variable that receives it, the result shall be type cast to the type of
the variable.
Numbers of input arguments during function call are strict according to its definition.
If function call is a part of expression, then multiple output of the function is illegal.
For example,
[a, b] = 5 + foo(c)
or
[a, b] = foo(c) + 5
Both these expressions are not legal: function call is a part of expression and must be evaluated in a single
value.
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