Notes

<h1 align="center">To find the square of a number</h1>
<form action="4.php" method="get">
Number<input type="text" name="x">
<input type="submit" name="su">
</form>
<?php
if (!empty($_GET['su'])) {
$a= $_GET['x'];
$b= $a*$a;
echo 'Its square is '.$b.'<br/>';

}
?>

<h1 align="center">Factorial of</h1>
<form action="5.php" method="post">
Number<input type="text" name="a">
<input type="submit" name="s">
</form>
<?php
if (!empty($_POST['s'])){
$k=$_POST['a'];


$fact=1;
for ($l=$k; $l >=1 ; $l--) {
$fact=$fact*$l;
}
echo 'Factorial of '.$k.' is '.$fact;
}





?>

<h1>To identify whether the given number is prime or not?</h1>
<form action="6.php" method="get" >
Number <input type="text" name="a">
<input type="submit" name="s">

</form>
<?php
if (!empty($_GET['s']))
{
if (is_numeric($_GET['a'])) {
$n= $_GET['a'];

$c = 1;
for ($i=2; $i<$n ; $i++) {
if ( $n % $i==0)
$c++;

}
if ($c==1) {

echo $n.' is a Prime number.';
}
else {

echo $n.' is not a Prime number.';

}
}
}



?>

<h1>To find out the Compound Amount and Compound Interest </h1>
<form action="7.php" method="get">
Principal <input type="text" name="a">
Time <input type="text" name="b">
Rate <input type="text" name="c"><br>
Number of times Interest Compounded <input type="text" name="d"><br>
<input type="submit" name="s">

</form>
<?php
if (!empty($_GET['s'])) {
$p= $_GET['a'];
$t= $_GET['b'];
$r= $_GET['c'];
$n= $_GET['d'];
$a=$r/$n;
$b=$n*$t;
$g=1;
$c= $g + $a;
$d= pow($c, $a);
$e=$p*$d;
$f=$e-$p;
if ($p) {
echo 'The compount amount is '. $e;
echo '<br/>. The Compound Interest is '. $f;
}

}


?>

<h1>To find out whether the given year is leap or not</h1>
<form action="8.php" method="get">
Year <input type="text" name="a">
<input type="submit" name="s">
</form>
<?php
if (!empty($_GET['s'])) {
if (is_numeric($_GET['a'])) {
$y= $_GET['a'];
if ($y % 4 == 0) {
echo 'This year is leap.';
}

else{
echo 'This is not a leap year.';
}
}
}
?>

<h1>To arrange the given number in reverse order</h1>
<form method="get" action="9.php">
Numbers<input type="text" name="a">
<input type="submit" name="su">
</form>
<?php
if (!empty($_GET['su']))
{
$s= $_GET['a'];
for ($s=1; $s >=1 ; $s++) {

}
$s= array($l,$k,$j,$h);
echo 'The reverse is '.$s[3],$s[2],$s[1],$s[0];
}


?>

<h1 align="center">Multiplication Table Of</h1>
<form action="10.php" method="get">
Number<input type="text" name="a">
<input type="submit" name="su">
</form>
<?php
if (!empty($_GET['su'])) {
$s= $_GET['a'];
for ($i=1; $i<=10 ; $i++) {
$d=$s*$i;
echo $s.'*'.$i.'='.$d.'<br/>';
}
}
?>

<h1>To determine the greater value</h1>
<form action="11.php" method="post">
Number1 <input type="text" name="a">
Number2 <input type="text" name="b">
<input type="submit" name="s">
</form>
<?php
if (!empty($_POST['s'])) {
if (is_numeric($_POST['a'])) {
$a= $_POST['a'];
$b= $_POST['b'];
if ($a>$b) {
echo $a.' is the greater number.';
}
else{
echo $b.' is the greater number.';
}
}
}

?>

<h1>Whether you are a child or not!!</h1>
<form action="12.php" method="get.php">
Age <input type="text" name="age">
<input type="submit" name="su">
</form>
<?php
if (!empty($_GET['su'])) {
if (is_numeric($_GET['age'])) {
$a= $_GET['age'];
$b=12;
echo 'Your name is Ram.'.'<br/>';
echo 'Your address is Kathmandu.'.'<br/>';
if ($a>$b) {
echo 'Your age is '. $a.'.';

echo '<br/>'.'You are not a child.';
}
else{

echo 'Your age is '. $a .'.';

echo '<br/>'.'You are a child.';

}
}
}

?>

<h1>To reverse a given number</h1>
<form action="13.php" method="get">
Number <input type="text" name="a">
<input type="submit" name="s" value="Reverse">
</form>


<?php
if (!empty($_GET['s'])) {
$n= $_GET['a'];

$v=0;

while ( $n > 1) {
$r= $n % 10;
$v= ($v*10) + $r;
$n=$n/10;


}
echo 'Its reverse is '. $v;
}
?>