我写了这段代码:
float b = 3.6;
我明白了:
<上一页>错误:未解决的编译问题:类型不匹配:无法从 double 转换为 float为什么?float
的定义是什么?
在 Java 中,当您键入一个十进制数为 3.6
时,它会被解释为一个 double
.double
是 64 位精度的 IEEE 754 浮点,而 float
是 32 位精度的 IEEE 754 浮点.由于 float
不如 double
精确,因此无法隐式执行转换.
如果你想创建一个浮点数,你应该以 f
结束你的数字(即:3.6f
).
更多解释请参见Java教程的原始数据类型定义.
I wrote this code:
float b = 3.6;
and I get this:
Error:Unresolved compilation problem: Type mismatch: cannot convert from double to float
Why? Whats the definition of float
?
In Java, when you type a decimal number as 3.6
, its interpreted as a double
. double
is a 64-bit precision IEEE 754 floating point, while float
is a 32-bit precision IEEE 754 floating point. As a float
is less precise than a double
, the conversion cannot be performed implicitly.
If you want to create a float, you should end your number with f
(i.e.: 3.6f
).
For more explanation, see the primitive data types definition of the Java tutorial.
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