Create an All-in-One sticky form to solve the common “two trains are moving toward each other”...
Create an All-in-One sticky form to solve the common “two trains are moving toward each other” word problem. The form should have three inputs, all numbers greater than 0: the speed of Train A ($SpeedA), the speed of Train B ($SpeedB), and the distance between the two trains ($Distance). For this problem, you will need the following equations:
$DistanceA = (($SpeedA / $SpeedB) * $Distance) / (1 + ($SpeedA / $SpeedB));
$DistanceB = $Distance - $DistanceA;
$TimeA = $DistanceA / $SpeedA;
$TimeB = $DistanceB / $SpeedB;
In the preceding equations, $DistanceA and $DistanceB are the distances traveled by Trains A and B, respectively; $TimeA and $TimeB are how long Trains A and B traveled, respectively ($TimeA should equal $TimeB). If $SpeedA or $SpeedB is allowed to be 0, PHP will display a “division by zero not allowed” error. Save the document as TwoTrains.php
Homework Answers
PHP PROGRAMMING SOURCE CODE
<html>
<body>
<form method="post">
<!-- Speed of train A in first textbox as input -->
Speed of Train A:
<input type="number" name="number1"
/><br><br>
<!-- Speed of train B in second textbox as input -->
Speed of Train B:
<input type="number" name="number2"
/><br><br>
<!-- Distance between train A and train B in third textbox as
input -->
Distance between the two trains(A,B):
<input type="number" name="number3"
/><br><br>
<!-- submit button to calculate results -->
<input type="submit" name="submit" value="Calculate">
</form>
<?php
// if submit button is pressed //
if(isset($_POST['submit']))
{
try
{
// take three
inputs in three variables//
$SpeedA = $_POST['number1'];
$SpeedB = $_POST['number2'];
$Distance=$_POST['number3'];
//if speed of train A or B is
zero,it will throw exception //
if($SpeedA==0 or $SpeedB==0 )
{
throw new Exception("division by zero not allowed");
}
// calculation the results from
given equations //
$DistanceA = (($SpeedA / $SpeedB) * $Distance) / (1 + ($SpeedA /
$SpeedB));
$DistanceB = $Distance - $DistanceA;
$TimeA = $DistanceA / $SpeedA;
$TimeB = $DistanceB / $SpeedB;
// print the results //
// here with number_format() method
results are considered up to 2 decimal place//
echo "The distance traveled by Train A :
".number_format($DistanceA,2);
echo "<br>";
echo "The distance traveled by Train B :
".number_format($DistanceB,2);
echo "<br>";
echo "The time taken by Train A : ".number_format($TimeA,2);
echo "<br>";
echo "The time taken by Train B : ".number_format($TimeB,2);
}
// thrown error details is
displayed through message//
catch(Exception $e) {
echo $e->getMessage();
}
}
?>
</body>
</html>
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Create an All-in-One sticky form to solve the common “two trains
are moving toward each other”...
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