char型变量c1是为数字字符的正确表达为()
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char型变量c1是为数字字符的正确表达为()
A."0"<=c1<="9"
B.(c1>="0")&&(c1<="9")
C.(c1>="0")||(c1<="9")
D.(c1> = 0)&&(c1<=9)

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C
char型变量c1是为数字字符的正确表达为()
A."0"<=c1<="9"
B.(c1>="0")&&(c1<="9")
C.(c1>="0")||(c1<="9")
D.(c1> = 0)&&(c1<=9)

C