After the first input, $ZAHL is 2, because 
$ZAHL =++$ZAHL

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increases its value. I'm not sure why your teacher showed you this construct, as there are many easier ways how to add one to a variable: 

$x++;
++$x;
$x += 1;
$x = $x + 1;

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Therefore, the input is compared to 

"KEKSE" x 2 . "E " x 2

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i.e. 

KEKSEKEKSEE E 
~~~~~       ~~
once     E + space
     ~~~~
    twice
         ~~
      E + space

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لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re^3: Loop and Add more cookies by choroba
in thread Loop and Add more cookies by Anonymous Monk

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