70 lines
2.3 KiB
PHP
70 lines
2.3 KiB
PHP
<!-- Sie sollen nun Aufgabe 13 so verbessern, dass auch nachdem die Seite nach dem Senden neu geladen hat, die Werte in den beiden Kästen und das Rechenzeichen nicht geleert werden. Es sollen also genau die vom User reingeschriebenen Werte wieder eingesetzt werden. -->
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<form action="" method="get">
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<label for="firstNumber">Erste Zahl:</label>
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<br/>
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<input type="number" value="<?php
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if(isset($_GET["firstNumber"]))
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echo $_GET["firstNumber"];
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?>" name="firstNumber" />
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<br/>
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<label for="nachname">Rechenzeichen:</label>
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<br/>
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<select name="sign" size="0">
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<option value="+" <?php
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if(isset($_GET["sign"]) && $_GET["sign"] == "+")
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echo "selected ";
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?>>+</option>
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<option value="-" <?php
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if(isset($_GET["sign"]) && $_GET["sign"] == "-")
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echo "selected ";
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?>>-</option>
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<option value="*" <?php
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if(isset($_GET["sign"]) && $_GET["sign"] == "*")
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echo "selected ";
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?>>*</option>
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<option value="/" <?php
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if(isset($_GET["sign"]) && $_GET["sign"] == "/")
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echo "selected ";
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?>>/</option>
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<option value="%" <?php
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if(isset($_GET["sign"]) && $_GET["sign"] == "%")
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echo "selected ";
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?>>%</option>
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</select>
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<br/>
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<label for="secondNumber">Zweite Zahl:</label>
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<br/>
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<input type="number" name="secondNumber" value="<?php
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if(isset($_GET["secondNumber"]))
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echo $_GET["secondNumber"];
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?>" />
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<br/>
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<input type="submit" value="senden" />
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</form>
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<?php
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if(!isset($_GET["firstNumber"]) || !isset($_GET["secondNumber"]) || !isset($_GET["sign"]) || !is_numeric($_GET["firstNumber"]) || !is_numeric($_GET["secondNumber"]) )
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exit();
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$firstNumber = $_GET["firstNumber"];
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$secondNumber = $_GET["secondNumber"];
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$sign = $_GET["sign"];
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$result = 0;
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if($sign == "+") $result = $firstNumber + $secondNumber;
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else if($sign == "-") $result = $firstNumber - $secondNumber;
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else if($sign == "*") $result = $firstNumber * $secondNumber;
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else if($sign == "%") $result = $firstNumber % $secondNumber;
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else if($secondNumber == "0") $result = "∞";
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else if($sign == "/") $result = $firstNumber / $secondNumber;
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else exit();
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echo "<p>$firstNumber $sign $secondNumber = $result</p>";
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?>
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