32 位和 64 位操作系统中的双字节大小 [英] The Double byte size in 32 bit and 64 bit OS
问题描述
运行时 double 大小有区别吗我的应用程序在 32 位和 64 位环境下?
Is there a difference in double size when I run my app on 32 and 64 bit environment?
如果我没记错的话,32位环境下的double会占用0后的16位,而64位环境下的double会占用32位,对吗?
If I am not mistaken the double in 32 bit environment will take up 16 digits after 0, whereas the double in 64 bit will take up 32 bit, am I right?
推荐答案
不,一个 IEEE 754 double-精度浮点数总是64位.类似地,单精度 float
总是 32 位.
No, an IEEE 754 double-precision floating point number is always 64 bits. Similarly, a single-precision float
is always 32 bits.
如果您的问题特别是关于 C# 和/或 .NET(如您的标签所示),所有的数据类型大小都是固定的,与您的系统架构无关.这与 Java 相同,但与 C 和 C++ 不同,后者的类型大小因平台而异.
If your question is about C# and/or .NET specifically (as your tag would indicate), all of the data type sizes are fixed, independent of your system architecture. This is the same as Java, but different from C and C++ where type sizes do vary from platform to platform.
整数类型在 C 和 C++ 中的不同体系结构上具有不同的大小是很常见的.例如,int
在 16 位 DOS 中为 16 位宽,在 Win32 中为 32 位宽.然而,IEEE 754 标准在浮点计算中无处不在,以至于 float
和 double
的大小在任何系统上不会变化在现实世界中找到--20 年前 double
是 64 位,今天也是.
It is common for the integral types to have different sizes on different architectures in C and C++. For instance, int
was 16 bits wide in 16-bit DOS and 32 bits wide in Win32. However, the IEEE 754 standard is so ubiquitous for floating-point computation that the sizes of float
and double
do not vary on any system you will find in the real world--20 years ago double
was 64 bits and so it is today.
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