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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

_lrotl, _lrotr

Rotates bits to the left (_lrotl) or right (_lrotr).

unsigned long _lrotl( 
   unsigned long value, 
   int shift  
); 
unsigned long _lrotr( 
   unsigned long value, 
   int shift  
);

value

Value to be rotated.

shift

Number of bits to shift value.

Both functions return the rotated value. There is no error return.

The _lrotl and _lrotr functions rotate value by shift bits. _lrotl rotates the value left. _lrotr rotates the value right. Both functions wrap bits rotated off one end of value to the other end.

Routine

Required header

_lrotl

<stdlib.h>

_lrotr

<stdlib.h>

For more compatibility information, see Compatibility in the Introduction.

Libraries

All versions of the C run-time libraries.

// crt_lrot.c

#include <stdlib.h>
#include <stdio.h>

int main( void )
{
   unsigned long val = 0x0fac35791;

   printf( "0x%8.8lx rotated left eight times is 0x%8.8lx\n", 
            val, _lrotl( val, 8 ) );
   printf( "0x%8.8lx rotated right four times is 0x%8.8lx\n", 
            val, _lrotr( val, 4 ) );
}

0xfac35791 rotated left eight times is 0xc35791fa
0xfac35791 rotated right four times is 0x1fac3579

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.

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