Display the sum of integers between 1 and N, where N must be entered by the user through a form
Display leap years between a range entered by the user.
I need help on two PHP exercises [closed]
-6
asked by anonymous 16.09.2017 / 21:05
2 answers
1
Assuming you already know how to create a form and get data from it, just use
array_sum to add the values of an array and range to create the array from 1 to the maximum value (or create it in some other way) . For example:
echo array_sum(range(1, (int)($_GET['N'] ?? 0)));
The date() function tells you whether the year is leap year or not, using L , see the documentation . Add the use of this with the use of range and with the use of strtotime (or mktime ) you can create the date and detect if it is leap or not. For example:
foreach(range((int)($_GET['Inicio'] ?? 1), (int)($_GET['Fim'] ?? 1)) as $ano){
if(date('L', strtotime($ano.'-01-01'))){
echo $ano . PHP_EOL;
}
}
You can also make a mod 4 ( ($ano % 4) === 0 ) to know whether or not it is leap.
16.09.2017 / 21:36
0
PHP
if (isset($_POST["numero"])){
$num=0;
$cont=$_POST["numero"];
$i = 1;
while ($i <= $cont){
$num=$num+$i;
$i++;
}
echo "A soma dos números de 1 a $cont é ". $num;
}
HTML - Form
<form action="" method="post">
<input type="number" placeholder="Numero" name="numero" required>
<button type="submit">Calcular</button>
</form>
Test here with php version - early php version 4.4.9
Then change the version in Run on PHP version to the desired version and click on the Execute code
16.09.2017 / 22:17