Just another update

Task/Call-a-function/ALGOL-68/call-a-function.alg

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+# A function without arguments: #
+f();
+# or #
+f;
+
+# A function with a fixed number of arguments: #
+f(1, x);
+
+# ALGOL 68 does not support optional arguments, variable numbers of arguments, or named
+arguments.
+However, some functions may take an argument "0" as an instruction to use the default value
+(sort of a pseudo-optional argument). #
+
+# In "Talk:Call a function" a statement context is explained as
+"The function is used as an instruction (with a void context),
+rather than used within an expression." Based on that,
+both ALGOL examples above are already in a statement context.
+For full ALGOL compatibility, though, they should be in the form "VOID (f ());" #
+
+# A function's return value being used: #
+x := f(y);
+
+# There is no distinction between built-in functions and user-defined functions. #
+
+# A subroutine is simply a function that returns VOID. #
+
+# If the function is declared with argument(s) of mode REF MODE,
+then those arguments are being passed by reference. #