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It is easy to notice similarity of structure of the program entirely and any of its procedures.Really, after all both procedure and the main program realise a certain algorithm, simply procedure does not give solution of all task. Difference in header and in the sign after End.
Format of the description of function:
Function <Function name> (<the Name of forms. Parametre 1>: <Type>;
<A name of forms. Parametre 2>: <Type>?): <result Type>;
<Declaration part>
Begin
<A function body>
End;
In a function body without fail there should be at least a command of assignment of such sort: <Function name>: = <Expression>;
The specified expression should lead to value of the same type, as type of result of the function, described above.
Procedure call represents the independent instruction in the program:
<A procedure name> (<Actual parametre 1>, <Actual parametre 2>?);
Types of actual parametres should be same, as for corresponding to them formal.
Function call should enter into expression. At calculation of value of such expression function will be called, the operations which are in its body, will be fulfilled, in expression value of result of function will be substituted.
Let's result the elementary example of usage of the subroutine.
The task: "to Find maximum of three entered numbers". For solution we will take advantage of the description of the function accepting value maximum from two numbers which are transferred in it in the form of parametres.
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