Beginning state: $c is not defined.
SV = NULL(0x0) at 0x1f5cec0
  REFCNT = 1
  FLAGS = ()


State after printing: $c is not defined.
SV = PV(0x1f3de10) at 0x1f5cec0
  REFCNT = 1
  FLAGS = ()
  PV = 0

0
State after integer operation: $c is not defined.
SV = PVNV(0x1f3c0d0) at 0x1f5cec0
  REFCNT = 1
  FLAGS = ()
  IV = 0
  NV = 0
  PV = 0

State after assignment: $c is defined.
SV = PVNV(0x1f3c0d0) at 0x1f5cec0
  REFCNT = 1
  FLAGS = (NOK,pNOK)
  IV = 0
  NV = 0
  PV = 0

State after assigning undef: $c is not defined.
SV = PVNV(0x1a0f0d0) at 0x1a2fec0
  REFCNT = 1
  FLAGS = ()
  IV = 0
  NV = 0
  PV = 0