72 lines
1.8 KiB
Markdown
72 lines
1.8 KiB
Markdown
Not every building has an infinit amount of floors. Our simulated building is supposed to have 10.
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So it makes no sense to move to a floor higher than 10.
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To encode that kind of behavior we need a new language feature. The <b>if-statement</b>.
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# Knowledge
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The if statement allows you to check, if a certain condition is met and only execute parts of your code if it is.
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if(condition)
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{
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// gets executed, if condition is true
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}
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else
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{
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// gets executed, if condition is false
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}
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The else part is optional.
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To formulate a condition you need new operators.
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<table>
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<tr>
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<th>Operator</th>
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<th>Meaning</th>
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</tr>
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<tr>
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<th>==</th>
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<th>True, when both sides are equal</th>
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</tr>
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<tr>
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<th>!=</th>
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<th>True, when both side are not equal</th>
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</tr>
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<tr>
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<th><</th>
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<th>True, when left is less than right</th>
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</tr>
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<tr>
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<th>></th>
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<th>True, when left is bigger than right</th>
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</tr>
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<tr>
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<th><=</th>
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<th>True, when left is less than or equal to the right</th>
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</tr>
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<tr>
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<th>>=</th>
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<th>True, when left is bigger or equal to the right</th>
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</tr>
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<tr>
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<th>&&</th>
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<th>Only true, if both conditions are true</th>
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</tr>
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<tr>
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<th>||</th>
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<th>True, when one condition is true</th>
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</tr>
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<tr>
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<th>!</th>
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<th>negates the condition</th>
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</tr>
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</table>
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## Model
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Our model now has a top floor, which is safed in the conveniently named variable ``TopFloor``.
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To represent that in the code you need to add a check if we already reached the top and react accordingly.
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## Task
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Your task is to check if the lift reached the top floor and change the direction to downwards.
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