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The user defined data type is formed by placing the needed declarative sentences Type block. For example, the call Exchange(3, 2) realizes the operations: The new values of x and y are returned to the caller. (3) the content of y is overwritten by those of the variable temp (it contains the value of x as passed at the call time. (2) the content of variable x is overwritten by the content of variable y (first is deleted and after deletion the content of y is copied y) (1) the content of variable x is stored in a temporary (working) variable named temp The call Exchange(x, y) means applying the operations included in the procedure body to variables x and y.In the computation block from the figure the numbered line means:įigure 1 The representation of Exchange operation The call is realized, in almost algorithmic programming languages (as C ++, Visual Basic, Pascal etc.) by writing the name of the procedure followed by the list of the arguments. The variables x and y from the name of the procedure Exchange(x,y) are named arguments and the real value for that are passed to the procedure at call time. This algorithm realize an interchange of the content of the variable named x with the content of the variable y. 1.5 Finding Min and Max From Two Values First Exampleġ.6 Finding Min and Max From Two Values Second Exampleġ.8 Finding Min and Max From Two Values Third Exampleġ.12 Determining The Factorial Second Exampleġ.13 Determining The Easter Date For a Wanted Year Exampleġ.14 Determining The Factorial Third Exampleġ.17 Fahrenheit To Celsius Correspondence Table Example