_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  
);  

Parameters

val
The integer to reverse byte order.

RoutineRequired 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  

Run-Time Routines by Category

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