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Can someone tell me if on the net exists any site or tutorial that explains these recursive procedures or functions.

Thanks

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## Comments

117: Can someone tell me if on the net exists any site or tutorial that explains these recursive procedures or functions.

: Thanks

:

hi recursive??

757: Can someone tell me if on the net exists any site or tutorial that explains these recursive procedures or functions.

: Thanks

Recursive functions are pretty easy to understand, but very confusing to use. Basically, you make a procedure that calls itself. This is done to accomplish things that would otherwise take alot of coding.

An example of recursive procedure is a FILL procedure in graphics or an equation such as the "Towers of Hanoi" (complicated ancient Monk problem)

Here is a basic recursive function:

[code]

FUNCTION Recursion(X : Word) : Word;

Begin

If X < 10 Then

Recursion := Recursion(X+1);

WriteLn('Recursion Function #',X);

End;

Begin

Recursion(1);

End.

[/code]

If you were to run this, you would have the following steps taken:

[01] Recursion(1) is called

[02] X(=01) < 10 Then Recursion := Recursion(X+1) is called;

[03] X(=02) < 10 Then Recursion := Recursion(X+1) is called;

[...]

[08] X(=07) < 10 Then Recursion := Recursion(X+1) is called;

[09] X(=08) < 10 Then Recursion := Recursion(X+1) is called;

[10] X(=09) < 10 Then Recursion := Recursion(X+1) is called;

[11] X(=10) is not < 10, so WriteLn('Recursion Function #',X);

[12] Exit Function and return to point where function was called

[13] X(=09)WriteLn('Recursion Function #',X);

[14] Exit Function and return to point where function was called

[15] X(=08)WriteLn('Recursion Function #',X);

[...]

[26] Exit Function and return to point where function was called

[27] X(=02)WriteLn('Recursion Function #',X);

[28] Exit Function and return to point where function was called

[29] X(=01)WriteLn('Recursion Function #',X);

[30] Done!

Your output would be:

[code]

Recursion Function #10

Recursion Function #9

Recursion Function #8

Recursion Function #7

Recursion Function #6

Recursion Function #5

Recursion Function #4

Recursion Function #3

Recursion Function #2

Recursion Function #1

[/code]

Hope this explains it a bit.

Phat Nat