creat_q
p1structcarmallocsizeofstructcar
fp1
extNULL
voidpush_qstructcarp
structcarp2
p2p1
whilep2
extNULL
p2p2
ext
p2
extp
p
extNULL
structcarpop_q
structcarp
pp1
ext
p1
extp1
ext
ext
retur
p
voidcome_i

voidi
terface
pri
tf