The 'fvrb-ex' package Example environments with the 'fancyvrb' package
Denis Girou · 1998
This package, built above the ‘fancyvrb’ one (from Timothy van Zandt), oer several kinds of the so-called example environments to format some code both in \verbatim mode and in the ormal way, below or on the side. The advantage of such environments is that the code itself is included only one time in the source code, which allow to be sure of the consistence of the two versions shown. Some other kinds of such environments are specially devoted to graphics, allowing to give the size of them. It is possible in this case to draw also a grid.