在32位与64位系统比较C++主要类型的长度

1、源代码

#include 

using namespace std;

int main(int argc, const char * argv[])
{
    cout << "sizeof(char) =      " << sizeof(char) << endl;
    cout << "sizeof(short) =     " << sizeof(short) << endl;
    cout << "sizeof(int) =       " << sizeof(int) << endl;
    cout << "sizeof(float) =     " << sizeof(float) << endl;
    cout << "sizeof(long) =      " << sizeof(long) << endl;
    cout << "sizeof(void *) =    " << sizeof(void *) << endl;
    cout << "sizeof(long long) = " << sizeof(long long) << endl;
    cout << "sizeof(double) =    " << sizeof(double) << endl;

    return 0;
}

2、32位系统

macos系统（版本号：10.13.2）

编译器：clang++

Apple LLVM version 9.0.0 (clang-900.0.39.2)

Target: x86_64-apple-darwin17.3.0）

编译选项：-arch i386

sizeof(char) =      1
sizeof(short) =     2
sizeof(int) =       4
sizeof(float) =     4
sizeof(long) =      4
sizeof(void *) =    4
sizeof(long long) = 8
sizeof(double) =    8

3、64位系统

macos系统（版本号：10.13.2）

编译器：clang++

Apple LLVM version 9.0.0 (clang-900.0.39.2)

Target: x86_64-apple-darwin17.3.0）

编译选项：-arch x86_64

sizeof(char) =      1
sizeof(short) =     2
sizeof(int) =       4
sizeof(float) =     4
sizeof(long) =      8
sizeof(void *) =    8
sizeof(long long) = 8
sizeof(double) =    8

4、长度对比表

32位系统与64位系统主要类型长度对比表

类型	32位系统长度	64位系统长度	说明
char	1	1
short	2	2
int	4	4
float	4	4
long	4	8	long类型：32位系统4字节，64位系统8字节
void *	4	8	指针类型：32位系统4字节，64位系统8字节
long long	8	8
double	8	8