1 m a r c – o l i v e r p a h l Rekursive Variante sum_rek(n){ if (n == 0) then return 0; fi return ( n + summe_rek( n-1 ) ); } public static int sum_rek(int.

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Presentation transcript:

1 m a r c – o l i v e r p a h l Rekursive Variante sum_rek(n){ if (n == 0) then return 0; fi return ( n + summe_rek( n-1 ) ); } public static int sum_rek(int n){ if ( n == 0 ) return 0; return ( n + sum_rek( n-1 ) ) } PseudocodeJava

2 m a r c – o l i v e r p a h l Kontext der Rekursion in Eclipse sum_rek( 3 )=> return ( 3 + sum_rek( 2 ) ) => return ( 3 + (return ( 2 + sum_rek( 1 ) ) ) ) => return ( 3 + (return ( 2 + (return (1 + sum_rek( 0 ) ) ) ) ) ) => return ( 3 + (return ( 2 + (return (1 + (return 0) ) ) ) ) ) => return ( 3 + (return ( 2 + (return (1 + 0 ) ) ) ) ) => return ( 3 + (return ( ) ) ) => return ( ) => 6 Debug hier

3 m a r c – o l i v e r p a h l Iterative Variante public static int sum_iter(int n){ int k = n; int erg = 0; while ( k >= 0) { erg = k + erg; k = k - 1; } return erg; } PseudocodeJava sum_iter(n){ k := n; erg := 0; while ( k >= 0 ) do { erg := k + erg; k := k - 1; } od return erg; }

4 m a r c – o l i v e r p a h l Ablauf der Iteration in Eclipse sum_iter( 3 )=> [erg = 0; k = 3;] => = 0)? > Ja =>=> [erg = 3; k =2;] => = 0)? > Ja =>=> [erg = 5; k =1;] => = 0)? > Ja =>=> [erg = 6; k =0;] => = 0)? > Ja =>=> [erg = 6; k =-1;] => = 0)? > Nein => return erg; => 6 Nur ein aktiver Aufruf von sum_iter Debug hier