CS1109 Lab 15

Put the work for this lab into a new folder public_html\cs1109\lab15.

Part 1: Don't foul your own nest

In a file called nested.php, write a PHP script that uses nested for-loops to output each of the following:

Square

1 2 3 4 5

Triangle 1

1 2

1 2 3

1 2 3 4

1 2 3 4 5

Triangle 2

1 2 3 4 5

2 3 4 5

3 4 5

4 5

Part 2: Funny farm

Take a copy of farm.html; do not modify it. It displays a form which offers checkboxes so the user can select which animals Old Macdonald has on his farm.

Write farm.php, which outputs the lyrics of Old Macdonald Had a Farm. Here's a reminder, where we assume that the user selects duck, cow and pig:

Old Macdonald had a farm ee-eye, ee-eye-oh.
And on that farm he had a duck ee-eye, ee-eye-oh.
With a quack, quack here and a quack, quack there.
Here a quack, there a quack, everywhere a quack, quack.
Old MacDonald had a farm, ee-eye, ee-eye-oh.

Old MacDonald had a farm ee-eye, ee-eye-oh.
And on that farm he had a cow ee-eye, ee-eye-oh.
With a moo, moo here and a moo, moo there.
Here a moo, there a moo, everywhere a moo, moo.
With a quack, quack here and a quack, quack there. 
Here a quack, there a quack, everywhere a quack, quack.
Old MacDonald had a farm ee-eye, ee-eye-oh.

Old MacDonald had a farm ee-eye, ee-eye-oh.
And on that farm he had a pig ee-eye, ee-eye-oh.
With a oink, oink here and a oink, oink there.
Here a oink, there a oink, everywhere a oink, oink.
With a moo, moo here and a moo, moo there.
Here a moo, there a moo, everywhere a moo, moo.
With a quack, quack here and a quack, quack there. 
Here a quack, there a quack, everywhere a quack, quack.
Old MacDonald had a farm ee-eye, ee-eye-oh.

Some notes:

As well as the array of user selections, create an associative array of animals and their noises (e.g. duck goes quack).
You will need a nested loop. Each verse introduces the next animal, but the noises of all the previously introduced animals are repeated — in reverse order!
It may be better to use for-loops, rather than foreach-loops.
Extra optional bit. It shouldn't say "a oink"; it should say "an oink". Fix it.

Part 3: Draughtsmanship

Take a copy of chess.html; do not modify it:

The user can enter a number, n, into the form. In a file called chess.php, write PHP that: takes the user's input; validates it (check that it is an integer between 1 and 12 inclusive); and uses for-loops to output a PNG image of an n by n chessboard. Each cell in your chessboard should have sides that are 40 pixels long. For example, this is the output in the case where n is 8:

A chessboard

If there are errors in the user's input, output a PNG image that contains an error message, like this:

Error message

For drawing, you will need three functions:

imagerectangle for drawing rectangles.
imagefilledrectangle for drawing rectangles and filling them with colour.
imagestring, which gives the simplest way of outputting text into an image.

Deadline: 1pm, Tuesday 19th February.

If you have named your files and folders correctly, your work will be collected automatically at that time by my software.

Challenge exercise: An Akiyoshi Illusion

Remember that challenge exercises are always optional. They do not form part of your year's work and they are not worth any marks. They are designed for those students who finish the main exercise quickly and easily, and wish to explore further.

Similar to above, the user enters a positive integer (which must be an odd number), call it n, into this form: bulge.html. In a file called bulge.php, write PHP that outputs a seemingly bulging n by n chessboard, like the first image on this page of Akiyoshi's Illusions.