我正在寻找关于基本c++类型大小的详细信息。
我知道这取决于架构(16位、32位、64位)和编译器。
但是c++有标准吗?
我在32位架构上使用Visual Studio 2008。以下是我得到的答案:
char : 1 byte
short : 2 bytes
int : 4 bytes
long : 4 bytes
float : 4 bytes
double: 8 bytes
我试图在不同的架构和编译器下找到char、short、int、long、double、float(以及其他我没有想到的类型)的大小的可靠信息,但没有多大成功。
c++标准是这样说的:
3.9.1,§2:
There are five signed integer types :
"signed char", "short int", "int",
"long int", and "long long int". In
this list, each type provides at least
as much storage as those preceding it
in the list. Plain ints have the
natural size suggested by the
architecture of the execution
environment (44); the other signed
integer types are provided to meet
special needs.
(44) that is, large enough to contain
any value in the range of INT_MIN and
INT_MAX, as defined in the header
<climits>.
结论:这取决于您使用的是哪种体系结构。其他任何假设都是错误的。