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Call a function: Difference between revisions
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* Functions without parameters can be called by omitting the parameter list (no empty brackets!):<lang Ada>S: String := Ada.Text_IO.Get_Line;</lang>
* Ada
...
A : Integer := F(12);
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C : Integer := F(12, 1); -- something different</lang>
* If the number of parameters of F where fixed to two, then B and C would be OK but A wouldn't.
* The caller is free to use either a positional parameters or named parameters, or a mixture of both (with positional parameters first) <lang Ada>Positional := H(A, F'Access); ▼
Named := H(Int => A, Fun => F'Access); ▼
Mixed := H(A, Fun=>F'Access); </lang>▼
* Ada does not support functions with a variable number of arguments. But a function argument can be an unconstrained array with as many values as you want:<lang Ada>type Integer_Array is array (Positive range <>) of Integer;
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B := Sum((1,2,3,4)); -- B = 10</lang>
* One can realize first-class functions by defining an access to a function as a parameter
Fun: not null access function (X: Integer; Y: Integer)
return Integer);
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X := H(A, F'Access) -- assuming X and A are Integers, and F is a function
-- taking two Integers and returning an Integer.</lang>
▲* The caller is free to use either a positional parameters or named parameters, or a mixture of both (with positional parameters first) <lang Ada>Positional := H(A, F'Access);
▲Named := H(Int => A, Fun => F'Access);
▲Mixed := H(A, Fun=>F'Access); </lang>
=={{header|Icon}} and {{header|Unicon}}==
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