055 10021 : C 语言的 for 语句中的表达式可以部分或全部省略,但两个 ( ) 不可省略。但当三个表达式均省略后,因缺少判断条件,循环会无限制地进行下去,形成死循环。
A.
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B.
++
C.
;
D.
,
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