单项选择题
What is the result？（）
A.4321 B.0000 C.An exception is thrown at runtime. D.Compilation fails because of an error in line 18.
What is the result？（） A.hi hiB.hi worldC.world worldD.C...
A.hi hi B.hi world C.world world D.Compilation fails. E.An exception is thrown at runtime.
What is the result？（） A.2B.3C.4D.6E.7F.Compilation fail...
A.2 B.3 C.4 D.6 E.7 F.Compilation fails.
What is the result？（） A.2-1B.2-4C.2-5D.3-1E.3-4F.3-5G.C...
A.2-1 B.2-4 C.2-5 D.3-1 E.3-4 F.3-5 G.Compilation fails. H.An exception is thrown at runtime.
