_byteswap_uint64, _byteswap_ulong, _byteswap_ushort
The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.
The latest version of this topic can be found at _byteswap_uint64, _byteswap_ulong, _byteswap_ushort.
Reverses the order of bytes in an integer.
Syntax
unsigned short _byteswap_ushort (
unsigned short val
);
unsigned long _byteswap_ulong (
unsigned long val
);
unsigned __int64 _byteswap_uint64 (
unsigned __int64 val
);
Parameters
val
The integer to reverse byte order.
Requirements
| Routine | Required header |
|---|---|
_byteswap_ushort |
<stdlib.h> |
_byteswap_ulong |
<stdlib.h> |
_byteswap_uint64 |
<stdlib.h> |
For more compatibility information, see Compatibility in the Introduction.
Example
// crt_byteswap.c
#include <stdlib.h>
int main()
{
unsigned __int64 u64 = 0x0102030405060708;
unsigned long ul = 0x01020304;
printf("byteswap of %I64x = %I64x\n", u64, _byteswap_uint64(u64));
printf("byteswap of %Ix = %Ix", ul, _byteswap_ulong(ul));
}
byteswap of 102030405060708 = 807060504030201
byteswap of 1020304 = 4030201