a2ps

a2ps --media=A4 -2 -A fill -b --left-title -f 4.23 *.h *.cpp -o output.ps

--media=A4
use A4 paper

-2
two pages

-A fill
don't leave blank pages

-b --left-title
much less verbose headings and no footers

-f 4.23
font size

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a2ps --media=A4 -2 -R -A fill -b --left-title *.h *.cpp -o output.ps

-R
portrait

Without -f, 80 columns

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ps2pdf14 -sPAPERSIZE=a4 output.ps