Added example that prints a multi-digit number. Added library functions in support.

[vvhitespace] / examples / print-number-from-stack / printnum.pvvs

@@ This program outputs "-42424242"

SSTTSTSSSSTTTSTSTSTTTTSTTSSTSN  | ST: Push -42424242
NSTTSTSN                        | FC: JSR>1010 (print number from stack; see stdlib)
SSSTSTSN                        | ST: Push +10 (ASCII '\n')
TNSS                            | IO: Putchar
NNN                             | FC: Terminate program

#include "stdio.pvvs"