标签:msdn nan das value span dash style 函数 infinite
The function int _finite(double x) returns 1 (true) if x is an ordinary number and 0 (false) if x is either infinite or not-a-number (NaN).
msdn中如下描述中INF和NaN  
 
 _finite   returns   a   nonzero   value   (TRUE)   if   its   argument  
 x   is   not   infinite,   that   is,   if   –INF   <   x   <   
+INF.   It   returns   0   (FALSE)   if   the   argument   is   infinite
   or   a   NaN. 
其中INF表示无穷大(浮点数有上溢出),
NaN标示not a number.
标签:msdn nan das value span dash style 函数 infinite
原文地址:http://www.cnblogs.com/mazhenyu/p/6398697.html