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.

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单项选择题

A.hi hi
B.hi world
C.world world
D.Compilation fails.
E.An exception is thrown at runtime.

单项选择题

What is the result？（）

A.2
B.3
C.4
D.6
E.7
F.Compilation fails.

单项选择题

What is the result？（）

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.