Graph of the int function, as in the C programming language. Note, that this image not mandatorily applies to other programming languages, e.g. PowerBasic, where the INT command works the same way as the floor function.

• 
  Floor
• 
  Ceiling
• 
  Int

See Wikipedia graph-making tips.

 The source code of this SVG is invalid due to 4 errors.

 This W3C-invalid plot was created with gnuplot.

Then I opened the resulting SVG file in Inkscape, changed the fill style for the circles (either blue or white fill), brought the plot lines to the top, and then brought the circles to the top (over the lines).

Created by User:Omegatron using gnuplot, possibly with post-processing in the GIMP (PNG) or Inkscape (SVG)

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• Mathworld's version