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【单选题】
判断 char 型变量 ch 是否为数字的正确表为( )。A.
‘ 0 ’ <=ch<= ’ 9 ’
B.
(ch>= ’ 0 ’ )&(ch<= ’ 9 ’ )
C.
(ch>= ’ 0 ’ )&&(ch<= ’ 9 ’ )
D.
(ch>= ’ 0 ’ )AND(ch<= ’ 9 ’ )
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