@ Verify gcd(0,0) = 0
SSSSN           | PUSH 0
SSSSN           | PUSH 0
NSTTSSTSN       | JSR > 10010 (math:gcd)
NSTTTTTSTN      | JSR > 111101 (debug:printsignednumber)

@ Verify gcd(4,0) = 4
SSSSN           | PUSH 0
SSSTSSN         | PUSH 4
NSTTSSTSN       | JSR > 10010 (math:gcd)
NSTTTTTSTN      | JSR > 111101 (debug:printsignednumber)

@ Verify gcd(0,4) = 4
SSSTSSN         | PUSH 4
SSSSN           | PUSH 0
NSTTSSTSN       | JSR > 10010 (math:gcd)
NSTTTTTSTN      | JSR > 111101 (debug:printsignednumber)

@ Verify gcd(6,9) = 3
SSSTSSTN        | PUSH 9
SSSTTSN         | PUSH 6
NSTTSSTSN       | JSR > 10010 (math:gcd)
NSTTTTTSTN      | JSR > 111101 (debug:printsignednumber)

@ Verify gcd(-6,9) = 3 
SSSTSSTN        | PUSH 9
SSTTTSN         | PUSH -6
NSTTSSTSN       | JSR > 10010 (math:gcd)
NSTTTTTSTN      | JSR > 111101 (debug:printsignednumber)

@ Verify gcd(-9,6) = 3
SSTTSSTN        | PUSH -9
SSSTTSN         | PUSH 6
NSTTSSTSN       | JSR > 10010 (math:gcd)
NSTTTTTSTN      | JSR > 111101 (debug:printsignednumber)


NNN             | DIE

#include <math.pvvs>
#include <debug.pvvs>