a=-2,求val("a")=?,val(a)=?说明原因.
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a=-2,求val("a")=?,val(a)=?说明原因.a=-2,求val("a")=?,val(a)=?说明原因.a=-2,求val("a")=?,val(a)=?说明原因.0和-2val("a
a=-2,求val("a")=?,val(a)=?说明原因.
a=-2,求val("a")=?,val(a)=?
说明原因.
a=-2,求val("a")=?,val(a)=?说明原因.
0和-2
val("a"),是把字符串"a"转换为数值型,这里的a不是前面那个变量,而是一个纯粹的字符,因为它不是数值,所以转换后只能是0
val(a),才是把变量a转换为数值,变量a的值本身即是-2,转换为数值后还是-2
a=-2,求val(a)=?,val(a)=?说明原因.
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