Просмотр исходного текста страницы C/Data Type/Bit Shift

==A bit shift example==



   
<source lang="cpp">
#include <stdio.h>
int main(void)
{
  unsigned int i;
  int j;
  i = 1;
  /* left shift i by 1, which is same as a multiply by 2 */
  for(j = 0; j < 6; j++) {
    i = i << 1;  
    printf("Left shift %d: %d\n", j, i);
  }
  /* right shift i by 1, which is same as a division by 2 */
 
  for(j = 0; j < 4; j++) {
    i = i >> 1;      
    printf("Right shift %d: %d\n", j, i);
  }
  return 0;
}
  
           
       </source>


==Shift bitwise and display the result==



   
<source lang="cpp">
#include <stdio.h>
void show_binary(unsigned u);
int main(void)
{
  unsigned short u;
  u = 45678;
  show_binary(u);
  u = u << 1;
  show_binary(u);
  u = u >> 1;
  show_binary(u);
  return 0;
}
void show_binary(unsigned u)
{
  int n;
  for( n = 32768; n > 0; n = n / 2 )
    if(u & n) 
        printf("1 ");
    else 
        printf("0 ");
  printf("\n");
}

           
       </source>


==Shift statement in for==


   
<source lang="cpp">
#include <stdio.h>
int main(void)
{
  unsigned u = 100;
  int n;
  for(n = 32768; n; n = n >> 1)
    if(u & n) 
        printf("1 ");
    else 
        printf("0 ");
  printf("\n");
  return 0;
}

           
       </source>


==Use bit shift to calculate==


   
<source lang="cpp">
#include <stdio.h>
int main(void)
{
  int i = 1;
  i <<= 3;  /* multiply by 2, 3 times */
  printf("%d", i);
  return 0;
}
           
       </source>