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_byteswap_uint64, _byteswap_ulong, _byteswap_ushort

Reverses the order of bytes in an integer.

unsigned short _byteswap_ushort (
   unsigned short val
);
unsigned long _byteswap_ulong (
   unsigned long val
);
unsigned __int64 _byteswap_uint64 (
   unsigned __int64 val
);

val

The integer to reverse byte order.

Routine

Required header

_byteswap_ushort

<stdlib.h>

_byteswap_ulong

<stdlib.h>

_byteswap_uint64

<stdlib.h>

For more compatibility information, see Compatibility in the Introduction.

// 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
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