多项选择题
A.鸡23兔12 B.鸡12兔23 C.鸡22兔13 D.鸡13兔22
A.doublefun(intx); B.doublefun(inty); C.intfun(intx,inty); D.doublefun(inta,intb);
A.aabb B.aabbccdd C.ABCABC D.AABBB