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在一个项目中，要求用VC6写DLL，其中有字段要求用UINT 16，vc6中没有UINT16。
UINT16，无符号int要16位，占2字节（1字节byte=8位bit）,1111 1111 1111 1111,表示范围0~65535。
在此，我想到用别的类型代替它,并对范围测试，
下面用vc6随便建一个程序，添加一个button双击添加代码：
0000 0000 0000 0000 ~ 1111 1111 1111 1111
short:默认带符号的，最高位1为符号位，表示范围 ： -32768~32767
unsigned short：为不带符号的，表示范围： 0~65535
signed short ：为带符号的，表示范围： -32768~32767
__int16,
__int32,这俩不知道是啥，不研究了，只是在vc6中无意看到有这种类型，等以后有空再研究。
<span style="white-space:pre"> </span>short a=1;
unsigned short b=1;
signed short c=1;
__int16 d;
__int32 e;
CString strSho;
int i;
while(1)
{
if (a>0)
{
a++;
}
else
{
a= a-1;
//strSho.Format("a = %d",a);
//AfxMessageBox(strSho);
break;
}
}
while(1)
{
if (b>0)
{
b++;
}
else
{
b = b - 1;
break;
}
}
while(1)
{
if (c>0)
{
c++;
}
else
{
c = c - 1;
break;
}
}
while(1)
{
if (d>0)
{
d++;
}
else
{
d = d - 1;
break;
}
}
while(1)
{
if (e > 0)
{
e++;
}
else
{
e = e - 1;
break;
}
}
strSho.Format("MAX a = %d,MAX b = %d, MAX c = %d, MAX d = %d, MAX e = %d",a,b,c,d,e);
AfxMessageBox(strSho);结果：
a=32767;
b=65535;
c=32767;
d=-13109;//这个不认识，算了，扔了吧
e=-858983461;//这个也不认识
补充：
刚刚看了下，__int16,__int32的介绍，下面是msdn的说法：
https://msdn.microsoft.com/en-us/library/29dh1w7z.aspx
Microsoft C/C++ features support for sized integer types. You can declare 8-, 16-, 32-, or 64-bit integer variables by using the __intn type specifier, where n is 8, 16, 32, or 64.
The following example declares one variable for each of these types of sized integers:
Copy
__int8 nSmall; // Declares 8-bit integer
__int16 nMedium; // Declares 16-bit integer
__int32 nLarge; // Declares 32-bit integer
__int64 nHuge; // Declares 64-bit integer
The types __int8, __int16, and __int32 are synonyms for the ANSI types that have the same size, and are useful for writing portable code that behaves identically across multiple platforms. The __int8 data type is synonymous with type char, __int16 is synonymous with type short, and __int32 is synonymous with type int. The __int64 type has no ANSI equivalent.
Example
The following sample shows that an __intxx parameter will be promoted to int:
Copy
// sized_int_types.cpp
#include <stdio.h>
void func(int i) {
printf_s(“%s\n”, __FUNCTION__);
}
int main()
{
__int8 i8 = 100;
func(i8); // no void func(__int8 i8) function
// __int8 will be promoted to int
}
func
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