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Task/Function-prototype/FreeBASIC/function-prototype.freebasic

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+' FB 1.05.0 Win64
+
+' The position regarding prototypes is broadly similar to that of the C language in that functions,
+' sub-routines or operators (unless they have already been fully defined) must be declared before they can be used.
+' This is usually done near the top of a file or in a separate header file which is then 'included'.
+
+' Parameter names are optional in declarations. When calling functions, using parameter names
+' (as opposed to identifying arguments by position) is not supported.
+
+Type MyType ' needed for operator declaration
+  i As Integer
+End Type
+
+Declare Function noArgs() As Integer  ' function with no argument that returns an integer
+Declare Function twoArgs(As Integer, As Integer) As Integer ' function with two arguments that returns an integer
+Declare Function atLeastOneArg CDecl(As Integer, ...) As Integer ' one mandatory integer argument followed by varargs
+Declare Function optionalArg(As Integer = 0) As Integer ' function with a (single) optional argument with default value
+Declare Sub noArgs2() ' sub-routine with no argument
+Declare Operator + (As MyType, As MyType) As MyType ' operator declaration (no hidden 'This' parameter for MyType)
+
+
+' FreeBASIC also supports object-oriented programming and here all constructors, destructors,
+' methods (function or sub), properties and operators (having a hidden 'This' parameter) must be
+' declared within a user defined type and then defined afterwards.
+
+
+Type MyType2
+  Public:
+    Declare Constructor(As Integer)
+    Declare Destructor()
+    Declare Sub MySub()
+    Declare Function MyFunction(As Integer) As Integer
+    Declare Property MyProperty As Integer
+    Declare Operator Cast() As String
+  Private:
+    i As Integer
+End Type