Questions and Answers: April 2013

Sunday, April 28, 2013

Array Element Tally

Say you had an election, and you needed to tally the votes for each candidate. All you need to do is enter the name of each candidate once it is read. Then, click the ADD button (or press the ENTER key) to add it to the array, as an array element. If you made a mistake, just click the REMOVE button to remove the last element added. The tally results are updated automatically. Each name will show the number of votes it received as well as the total votes cast for the entire election.

Type in the ARRAY ELEMENT:

Add

Remove

TALLY:

Saturday, April 27, 2013

Codecademy Sample Solution: Challenge Time

<!DOCTYPE html>
<html>
<head>
<title> Challenge Time! </title>
<link type='text/css' rel='stylesheet' href='style.css'/>
</head>
<body>

<?php
// Your code here
class Cat{
public $isAlive = true;
public $numLegs = 4;
public $name;

public function __construct($name){
$this->name = $name;
}

public function meow(){
return "Meow meow";
}
}

$cat1 = new Cat('CodeCat');
echo $cat1->meow();
?>

</body>
</html>

Codecademy Sample Solution: Putting It All Together, Part II

<!DOCTYPE html>
<html>
<head>
<title> Practice makes perfect! </title>
<link type='text/css' rel='stylesheet' href='style.css'/>
</head>
<body>


<?php
class Dog{
public $numLegs = 4;
public $name;

public function __construct($name){
$this->name = $name;
}

public function bark(){
return "Woof!";
}

public function greet(){
return "My name is $this->name.";
}
}

$dog1 = new Dog('Barker');
$dog2 = new Dog('Amigo');
echo $dog1->bark();
echo $dog2->greet();
?>

</body>
</html>

Codecademy Sample Solution: Putting It All Together, Part I

<!DOCTYPE html>
<html>
<head>
<title> Practice makes perfect! </title>
<link type='text/css' rel='stylesheet' href='style.css'/>
</head>
<body>


<?php
class Dog{
public $numLegs = 4;
public $name;

public function __construct($name){
$this->name = $name;
}

public function bark(){

}

public function greet(){

}
}
?>

</body>
</html>

Codecademy Sample Solution: A Method to the Madness

<!DOCTYPE html>
<html>
<head>
<title>Reconstructing the Person Class</title>
<link type='text/css' rel='stylesheet' href='style.css'/>
</head>
<body>


<?php
class Person{
public $isAlive = true;
public $firstname;
public $lastname;
public $age;

public function __construct($firstname, $lastname, $age){
$this->firstname = $firstname;
$this->lastname = $lastname;
$this->age = $age;
}

public function greet(){
return "Hello, my name is " . $this->firstname . " " . $this->lastname . ". Nice to meet you! :-)";
}
}
$teacher = new Person('boring', '12345', 12345);
echo $teacher->greet();
$student = new Person('Anony', 'mous', 100);
echo $student->greet();
?>

</body>
</html>

Codecademy Sample Solution: Property Panic (2)

<!DOCTYPE html>
<html>
<head>
<title>Reconstructing the Person Class</title>
<link type='text/css' rel='stylesheet' href='style.css'/>
</head>
<body>


<?php
class Person{
public $isAlive = true;
public $firstname;
public $lastname;
public $age;

public function __construct($firstname, $lastname, $age){
$this->firstname = $firstname;
$this->lastname = $lastname;
$this->age = $age;
}
}
$teacher = new Person('boring', '12345', 12345);
$student = new Person('Anony', 'mous', 100);
echo $student->age;
?>

</body>
</html>

Codecademy Sample Solution: Property Panic (1)

Codecademy Sample Solution: Building Your First Class

Friday, April 26, 2013

Codecademy Sample Solution: Putting it All Together

<html>
<head>
<title>I am the King of Arrays!</title>
</head>
<body>

<?php
// On the line below, create your own associative array:
$myArray = array('feet'=>'shoes', 'hands'=>'gloves', 'head'=>'hat');

// On the line below, output one of the values to the page:
print $myArray['head']." ";

// On the line below, loop through the array and output
// *all* of the values to the page:
foreach($myArray as $key => $value){
print $key .'=>'. $value." ";
}

?>

</body>
</html>

Codecademy Sample Solution: Multidimensional Arrays

<html>
<head>
<title>Blackjack!</title>
</head>
<body>

<?php
$deck = array(array('2 of Diamonds', 2),
array('5 of Diamonds', 5),
array('7 of Diamonds', 7),
array('8 of Clubs', 8));

// Imagine the first chosen card was the 7 of Diamonds.
// This is how we would show the user what they have:
echo 'You have the ' . $deck[3][0] . '!';
?>

</body>
</html>

Codecademy Sample Solution: Iterating Over Associative Arrays

<html>
<head>
<title>Iteration Nation</title>
</head>
<body>

<?php
$food = array('pizza', 'salad', 'burger');
$salad = array('lettuce' => 'with',
'tomato' => 'without',
'onions' => 'with');

// Looping through an array using "for".
// First, let's get the length of the array!
$length = count($food);

// Remember, arrays in PHP are zero-based:
for ($i = 0; $i < $length; $i++) {
echo $food[$i] . ' ';
}

echo ' I want my salad: ';

// Loop through an associative array using "foreach":
foreach ($salad as $ingredient=>$include) {
echo $include . ' ' . $ingredient . ' ';
}

echo ' ';

// Create your own array here and loop
// through it using foreach!
$gadget = array('programming' => 'iMac', 'calls' => 'iPhone', 'ebooks' => 'iPad');
foreach ($gadget as $key => $value){
echo "I use the ".$value." for ".$key.". ";
}

?>

</body>
</html>

Codecademy Sample Solution: Accessing Associative Arrays

<html>
<head>
<title>Accessing Associative Arrays</title>
</head>
<body>

<?php
// This is an array using integers as the indices...
$myArray = array(2012, 'blue', 5, 'BMW');

// ...and this is an associative array:
$myAssocArray = array('year' => 2012,
'colour' => 'blue',
'doors' => 5,
'make' => 'BMW');

// This code will output "blue".
echo $myArray[1];
echo ' ';

// Add your code here!
echo "My car was purchased in $myArray[0] and has ". $myAssocArray['doors'] ." doors.";
?>

</body>
</html>

Codecademy Sample Solution: Using Arrays as Maps

<html>
<head>
<title>Making the Connection</title>
</head>
<body>

<?php
// This is an array using integers as the indices.
// Add 'BMW' as the last element in the array!
$car = array(2012, 'blue', 5, 'BMW');

// This is an associative array.
// Add the make => 'BMW' key/value pair!
$assocCar = array('year' => 2012,
'colour' => 'blue',
'doors' => 5,
'make' => 'BMW');

// This code should output "BMW"...
echo $car[3];
echo ' ';

// ...and so should this!
echo $assocCar['make'];
?>

</body>
</html>

Codecademy Sample Solution: Review of Arrays

<html>
<head>
<title>Array Review</title>
</head>
<body>

<?php
$fruits = array("bananas", "apples", "pears"); /* Your code here! */
echo 'I love eating ' . $fruits[1]/* Your code here! */ . ' too!';
?>

</body>
</html>

Codecademy Sample Solution: Practice Makes Perfect

Codecademy Sample Solution: Parameters and Arguments

Codecademy Sample Solution: The Return Keyword

Codecademy Sample Solution: Calling Your Function

Codecademy Sample Solution: Your First Function

Codecademy Sample Solution: Function Refresher

Thursday, April 25, 2013

Codecademy Sample Solution: Show What You Know!

Codecademy Sample Solution: Array Functions II

Codecademy Sample Solution: Array Functions I

Codecademy Sample Solution: Math Functions I

Codecademy Sample Solution: String Functions II

Codecademy Sample Solution: String Functions I

Codecademy Sample Solution: Introducing Functions

Tuesday, April 23, 2013

Codecademy Sample Solution: All On Your Own!

<!DOCTYPE html>
<html>
<head>
<title>Your own do-while</title>
<link type='text/css' rel='stylesheet' href='style.css'/>
</head>
<body>
<?php
//write your do-while loop below
$loopCount = 0;
do{
echo "LoopCount value is {$loopCount}.";
$increment = rand(0,2);
$loopCount = $loopCount + $increment;
}while($loopCount<15);
?>
</body>
</html>

Codecademy Sample Solution: Completing the Loop

<!DOCTYPE html>
<html>
<head>
<title>Much a do-while</title>
</head>
<body>
<?php
$loopCond = false;
do{
echo "The loop ran even though the loop condition is false.";
}while($loopCond);
echo "Now the loop is done running.";
?>
</body>
</html>

Codecademy Sample Solution: Using Endwhile

<!DOCTYPE html>
<html>
<head>
<title>A loop of your own</title>
<link type='text/css' rel='stylesheet' href='style.css'/>
</head>
<body>
<?php
//Add while loop below
$loopCount = 0;
while($loopCount < 10):
echo "The current loop count is $loopCount";
$loopCount++;
endwhile;
?>
</body>
</html>

Codecademy Sample Solution: Your First While Loop

<!DOCTYPE html>
<html>
<head>
<title>A loop of your own</title>
<link type='text/css' rel='stylesheet' href='style.css'/>
</head>
<body>
<?php
//Add while loop below
$loopCount = 0;
while($loopCount < 10){
echo "The current loop count is $loopCount";
$loopCount++;
}
?>
</body>
</html>

Codecademy Sample Solution: While Loop Syntax

<!DOCTYPE html>
<html>
<head>
<title>Your First PHP while loop!</title>
</head>
<body>
<?php
$loopCond = true;
while ($loopCond){
//Echo your message that the loop is running below
echo "The loop is running.";
$loopCond = false;
}
echo "And now it's done.";
?>
</body>
</html>

Sunday, April 21, 2013

Codecademy Sample Solution: All On Your Own

Codecademy Sample Solution: Practicing With ForEach

Codecademy Sample Solution: When To Use 'For'

Codecademy Sample Solution: Writing Your First 'For' Loop

Codecademy Sample Solution: 'For' Loop Syntax

<html>
<head>
<title>For Loops</title>
</head>
<body>

<?php
// Echoes the first five even numbers
for ($i = 2; $i < 11; $i = $i + 2) {
echo $i;
}
?>

</body>
</html>

Saturday, April 20, 2013

Codecademy Sample Solution: Deleting Array Elements

<html>
<head>
<title>Modifying Elements</title>
</head>
<body>

<?php
$languages = array("HTML/CSS",
"JavaScript", "PHP", "Python", "Ruby");
// Write the code to remove Python here!

unset($languages[3]);

// Write your code above this line. Don't
// worry about the code below just yet; we're
// using it to print the new array out for you!

foreach($languages as $lang) {
print "$lang";
}
?>

</body>
</html>

Codecademy Sample Solution: Modifying Array Elements

<html>
<head>
<title>Modifying Elements</title>
</head>
<body>

<?php
$languages = array("HTML/CSS",
"JavaScript", "PHP", "Python", "Ruby");

// Write the code to modify
// the $languages array!
$languages[2] = "C++";
echo $languages[2];
?>

</body>
</html>

Codecademy Sample Solution: Access by Offset with {}

<html>
<head>
<title>Accessing Elements</title>
</head>
<body>

<?php
$tens = array(10, 20, 30, 40, 50);
echo $tens{2};
?>

</body>
</html>

Codecademy Sample Solution: Access by Offset with []

<html>
<head>
<title>Accessing Elements</title>
</head>
<body>

<?php
$tens = array(10, 20, 30, 40, 50);
echo $tens[2];
?>

</body>
</html>

Codecademy Sample Solution: Creating Your First Array

<html>
<head>
<title>My First Array</title>
</head>
<body>

<?php
$friends = array("Bosh", "Lebron", "Wade");
?>

</body>
</html>

Codecademy Sample Solution: Array Syntax

<html>
<head>
<title>Woot, More Arrays!</title>
</head>
<body>

<?php
// Add your array elements after
// "Beans" and before the final ")"
$array = array("Egg", "Tomato", "Beans", "Chips", "Sausage" );
?>

</body>
</html>

Thursday, April 18, 2013

Codecademy Sample Solution: All On Your Own!

<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<?php
$GIjoe = 'Snake Eyes';
switch($GIjoe):
case 'Lady Jane':
echo 'Baroness is hotter';
break;
case 'Duke':
echo 'Dead in thirty minutes';
break;
case 'Snake Eyes':
echo 'Silence is deadly';
break;
default:
echo 'Bruce ain\'t no Joe';
endswitch;
?>
</body>
</html>

Codecademy Sample Solution: Using "Endswitch". Syntactic Sugar!

<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<?php
$i = 5;

switch ($i):
case 0:
echo '$i is 0.';
break;
case 1:
case 2:
case 3:
case 4:
case 5:
echo '$i is somewhere between 1 and 5.';
break;
case 6:
case 7:
echo '$1 is either 6 or 7.';
break;
default:
echo "I don't know how much \$i is";
break;
endswitch;
?>
</body>
</html>

Codecademy Sample Solution: Multiple Cases: Falling Through!

<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<?php
$i = 5;

switch ($i) {
case 0:
echo '$i is 0.';
break;
case 1:
case 2:
case 3:
case 4:
case 5:
echo '$i is somewhere between 1 and 5.';
break;
case 6:
case 7:
echo '$1 is either 6 or 7.';
break;
default:
echo "I don't know how much \$i is";
break;
}
?>
</body>
</html>

Codecademy Sample Solution: Switch Syntax

<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<?php
$fruit = "Apple";

switch ($fruit) {
case 'Apple':
echo "Yummy.";
break;
default:
echo "Mmm. Tasty.";
}

?>
</body>
</html>

Codecademy Sample Solution: Glance at the Past!

<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<?php
$var = 1;
if($var < 1){
echo "Variable is less than 1.";
}
elseif($var > 1){
echo "Variable is greater than 1.";
}
else{
echo "Variable is less than 1.";
}
?>
</body>
</html>

Monday, April 15, 2013

Codecademy Sample Solution: All Together Now!

<html>
<head>
<title>If, Elseif, and Else</title>
</head>
<body>

<?php
$guess = 7;
$number = 7;

// Write your if/elseif/else statement here!
if($guess<$number){
echo "Too low!";
}
elseif($guess>$number){
echo "Too high!";
}
else{
echo "You win!";
}
?>

</body>
</html>

Codecademy Sample Solution: Else + If = Elseif

<html>
<head>
<title>Our Shop</title>
</head>
<body>

<?php
$items = 1; // Set this to a number greater than 5 to graduate from the exercise
if($items == 1){
echo "Sorry, no discount!";
}
elseif ($items > 5){
echo "You get a 10% discount!";
}
else{
echo "You get a 5% discount!";
}
?>

</body>
</html>

Codecademy Sample Solution: Adding an Else

<html>
<head>
<title>Our Shop</title>
</head>
<body>

<?php
$items = 4; // This might cause an error since the exercise still expects a "TRUE" answer
if ($items > 5){
echo "You get a 10% discount!";
}
else{
echo "You get a 5% discount!";
}
?>

</body>
</html>

Codecademy Sample Solution: Your First 'if'

<html>
<head>
<title>Our Shop</title>
</head>
<body>

<?php
$items = 7; // Set this to a number greater than 5!
if ($items > 5){
echo "You get a 10% discount!";
}
?>

</body>
</html>

Codecademy Sample Solution: Making Comparisons

<html>
<head>
<title>Comparing Numbers</title>
</head>
<body>

<?php
$teabags = 3;
if($teabags < 7)
echo "true";
?>

</body>
</html>