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合法数据是这样的

Posted by CSGrandeur at 2012-02-03 23:54:02 on Problem 3332
指数部分和底数部分可以都有可以只有其中一个。
底数要么没小数点,要么小数点两边都要有数。
指数没小数点。
可以'e'也可以'E'。
例如:
0.0
0
e0
0.0e0
0e0
0E0
都是合法的

0e
0.
.0
+-0
+
+e0
都是非法的

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