_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

 #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