A Gentle Introduction to
Programming

Tutorial: Boxes - Modulus.

The modulus operator % gives the remainder when one number is divided by another.

i % 2 gives 0 if i is even and 1 if i is odd.

Change the code so that the stripes are vertical.

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Change the code so that the stripes are at 0, 4 and 8.

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The grid shown has red if either i or j is an even number.

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Produce the checker board pattern shown.

Look at i+j is it odd or even?

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Diagonal stripes.

Look at i+j % 3

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Now we are just playing, stop this and move onto something less silly!

Diagonal grid.

Look at i+j also consider i-j

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