Modulus Tutorial

Boxes Tutorials

Test Equality

Modulus Tutorial

Testing Ranges

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

Vertical Stripes

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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static Color pickCol(int i, int j) { if (j % 2 == 0) return Color.red; else return Color.white; }

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test text

 

 

 

 

Spaced Stripes

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

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static Color pickCol(int i, int j) { if (j % 3 == 0) return Color.red; else return Color.white; }

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test text

 

 

 

 

Grid

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

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static Color pickCol(int i, int j) { return Color.white; }

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test text

 

 

 

 

Chess board

Produce the checker board pattern shown.

Hint

Look at i+j is it odd or even?

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static Color pickCol(int i, int j) { return Color.white; }

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test text

 

 

 

 

Trailing diagonal stripes

Diagonal stripes.

Hint

Look at (i+j)% 3

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static Color pickCol(int i, int j) { return Color.white; }

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test text

 

 

 

 

Diagonal grid

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

Diagonal grid.

Hint

Look at i+j also consider i-j

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static Color pickCol(int i, int j) { return Color.white; }

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test text