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_rotl, _rotr

Header File

stdlib.h

Category

Math Routines

Prototype

unsigned short _rotl(unsigned short value, int count);

unsigned short _rotr(unsigned short value, int count);

Description

Bit-rotates an unsigned short integer value to the left or right.

_rotl rotates the given value to the left count bits.

_rotr rotates the given value to the right count bits.

Return Value

_rotl, and _rotr return the rotated integer:

- _rotl returns the value of value left-rotated count bits.
- _rotr returns the value of value right-rotated count bits.

Example
Copy Code

    #include <stdlib.h>
    #include <stdio.h>
    /* rotl example */
    int rotl_example(void)
    {
       unsigned value, result;
       value = 32767;
       result = _rotl(value, 1);
       printf("The value %u rotated left one bit is: %u\n", value, result);
       return 0;
    }
    /* rotr example */
    int rotr_example(void)
    {
       unsigned value, result;
       value = 32767;
       result = _rotr(value, 1);
       printf("The value %u rotated right one bit is: %u\n", value, result);
       return 0;
    }
    int main(void)
    {
       rotl_example();
       rotr_example();
       return 0;
    }

Portability

| POSIX | Win32 | ANSI C | ANSI C++
_rotl |  | + |  |
_rotr |  |  |  |

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