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<?php // Инициализация переменных $num1 = $num2 = $num3 = 0; $sum = 0; $formSubmitted = false; // Проверка отправки формы if (isset($_POST['submit'])) { $formSubmitted = true; $num1 = isset($_POST['num1']) ? (float)$_POST['num1'] : 0; $num2 = isset($_POST['num2']) ? (float)$_POST['num2'] : 0; $num3 = isset($_POST['num3']) ? (float)$_POST['num3'] : 0; $sum = $num1 + $num2 + $num3; } ?> <!DOCTYPE html> <html> <head> <title>Калькулятор суммы</title> </head> <body> <h2>Сумма трёх чисел</h2> <form method="post" action=""> Число 1: <input type="number" step="any" name="num1" value="<?= $num1 ?>"><br><br> Число 2: <input type="number" step="any" name="num2" value="<?= $num2 ?>"><br><br> Число 3: <input type="number" step="any" name="num3" value="<?= $num3 ?>"><br><br> <input type="submit" name="submit" value="Вычислить сумму"> </form> <?php if ($formSubmitted): ?> <h3>Результат: <?= $num1 ?> + <?= $num2 ?> + <?= $num3 ?> = <?= $sum ?></h3> <?php endif; ?> </body> </html>
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<?php // Инициализация переменных $num1 = $num2 = $num3 = 0; $sum = 0; $formSubmitted = false; // Проверка отправки формы if (isset($_POST['submit'])) { $formSubmitted = true; $num1 = isset($_POST['num1']) ? (float)$_POST['num1'] : 0; $num2 = isset($_POST['num2']) ? (float)$_POST['num2'] : 0; $num3 = isset($_POST['num3']) ? (float)$_POST['num3'] : 0; $sum = $num1 + $num2 + $num3; } ?> <!DOCTYPE html> <html> <head> <title>Калькулятор суммы</title> </head> <body> <h2>Сумма трёх чисел</h2> <form method="post" action=""> Число 1: <input type="number" step="any" name="num1" value="<?= $num1 ?>"><br><br> Число 2: <input type="number" step="any" name="num2" value="<?= $num2 ?>"><br><br> Число 3: <input type="number" step="any" name="num3" value="<?= $num3 ?>"><br><br> <input type="submit" name="submit" value="Вычислить сумму"> </form> <?php if ($formSubmitted): ?> <h3>Результат: <?= $num1 ?> + <?= $num2 ?> + <?= $num3 ?> = <?= $sum ?></h3> <?php endif; ?> </body> </html>
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