Why does 0x1p3
equal 8.0
? Why does 0x1e3
equal 483
, whereas 0x1e3d
equals 7741
? It is confusing since 1e3d
equals 1000.0
.
0x1e3
and 0x1e3d
are hexadecimal integer literals. Note that e
and d
are hexadecimal digits, not the exponent indicator or double
type indicator in this case.
1e3d
is a decimal floating-point literal. The e
is the exponent indicator, the d
says that this is a double
rather than a float
.
The notation 0x1p3
is a way to express a floating-point literal in hexadecimal, as you can read in section 3.10.2 of the Java Language Specification. It means 1 times 2 to the power 3; the exponent is binary (so, it's 2-to-the-power instead of 10-to-the-power).
0x1e3 是 483 的十六进制,7741 的 0x1e3d 十六进制也是。 e
被读取为值为 14 的十六进制数字。
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