Question

right shifting my integer variable 4 bits

Asked by: yannimars

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

int main( void )
{
   unsigned x; /* variable to hold user input */
   unsigned c; /* counter */
 
   printf( "Enter an unsigned integer: " );
   scanf( "%u", &x );

   /* define displayMask and left shift 31 bits */
   unsigned displayMask = 1 << 31;

   printf( "%10u = ", x );
   /* loop through bits */
   for ( c = 1; c <= 32; c++ ) {
      putchar( x & displayMask ? '1' : '0' );
      x <<= 1; /* shift value left by 1 */  



      if ( c % 8 == 0 ) { /* output space after 8 bits */
         putchar( ' ' );
      } /* end if */
   } /* end for */

 
   putchar( '\n' );
system("pause");
return 0;
} /* end function displayBits */


I have got this far but now that I have printed the bits without moving it over 4 to the right I need to print it again with the bits moved over 4 bits.  I have hit a wall.

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Asked On
2007-09-18 at 09:33:47ID22836508
Tags

shifting

,

right

,

bits

,

integer

,

4

Topic

C Programming Language

Participating Experts
3
Points
500
Comments
4

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Answers

 

by: jkrPosted on 2007-09-18 at 09:49:10ID: 19914558

You are looking for the "Bitwise Left Shift and Right Shift Operators:  <<, >>". The bitwise shift operators shift their first operand left (<<) or right (>>) by the number of positions the second operand specifies. So, for your purpose, that would be

unsigned short us = 16; // set MSB

us = us >> 4; // move four bits

 

by: PaulCaswellPosted on 2007-09-19 at 12:29:16ID: 19923658

If you put your loop into a separate function you can then call it twice, once with parameter 'x' and once with parameter x >> 4.

Paul

 

by: Thorn3Posted on 2008-01-21 at 01:33:51ID: 20704750

Here is a function.. just like paul said. Call it twice, once shifted

#include <stdio.h>
 
void printBin(int value)
{
    int mask = 1<<(sizeof(int)*8)-1;
    int i;
    for(i=1; i <= sizeof(int)*8;i++)
    {
        putchar(mask&value? '1':'0');
        value<<=1;
        if(i%8==0)
            putchar(' ');
    }
}
 
int main()
{
    int a = 0x00808000;
    printBin(a);
    putchar('\n');
    printBin(a<<4);
    putchar('\n');
 
    return 0;
}
 
 
OUTPUT
------
00000000 10000000 10000000 00000000
00001000 00001000 00000000 00000000
                                              
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