Perform left and right rotations - C++ Operator

C++ examples for Operator:Bit Operator

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Description

Perform left and right rotations

Demo Code

#include <iostream>
using namespace std;

unsigned char rol(unsigned char val) {
  int highbit;/*from w  ww  .  j  a  v a2  s .c  o m*/
  if (val & 0x80) // 0x80 is the high bit only
    highbit = 1;
  else
    highbit = 0;
  // Left shift (bottom bit becomes 0):
  val <<= 1;
  // Rotate the high bit onto the bottom:
  val |= highbit;
  return val;
}
unsigned char ror(unsigned char val) {
  int lowbit;
  if (val & 1) // Check the low bit
    lowbit = 1;
  else
    lowbit = 0;
  val >>= 1; // Right shift by one position
         // Rotate the low bit onto the top:
  val |= (lowbit << 7);
  return val;
}

int main()
{
  int firstnum, secnum;

  unsigned char c = rol('x');
  cout << c;

  c = ror(c);
  cout << c;

  return 0;
}

Result


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