来自 | 博客园 作者 | 武沛齐
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为啥会有上述图片的现象呢？其实是由于float底层存储原理导致，下面听我娓娓道来。
第一步：浮点数转换为二进制表示
-
整数部分，直接转换为二进制，即：`100111` -
小数部分，让小数一直乘2，小于1则用结果继续乘，大于1则结果减1继续乘，等于1则结束。
0.25 * 2 = 0.5 // 小于1，则继续乘
0.5 * 2 = 1 // 等于1，则结束
结束时，将相乘之后等结果的整数部分拼接起来，所以 0.25 的二进制表示：01
-
Float32，用32位的二进制来存储一个浮点数。 -
Float64，用64位的二进制来存储一个浮点数。
在开发中想精确的处理小数时，可以使用decimal。
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