pre0405 用 while 和 do-while 循环时,循环变量初始化的操作应在 ( ) 完成。
A.
while 或do-while语句之前
B.
while 或do-while语句之后
C.
while 或do-while语句之间
D.
while或do-while语句的前、中、后均可
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