double x=1.52,y=5.

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double x=1.52,y=5.
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double x=1.52,y=5.
double x=1.52,y=5.

double x=1.52,y=5.
double 是定义一种叫双精度数据类型的关键字
double x=1.52,y=5.2
这句话的意思就是定义变量x,y它们是双精度数据类型的变量,同时给了他们一个初始的值,x是1.52,y是5.2也就是 现在的x为1.52,y为5.2

double应该是双精度数吧。32位,4个字节。15到16个有效位

double 就是一对的意思,你用那个值除以二就是X的值了。

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