#include <stdio.h>
/* Note: this program requires double to be 64 bit and char to be 8 bit 
 * It does NOT check this (e.g. via a sizeof-call) */

int main(int argc, const char** argv)
{
 // Fail if num of cmd line args isn't 2 (first arg is program name!) 
 if (argc!=2) { printf("Please use: bitwise [number] \n"); return(1);}
 
 // Define a union so the double and an array of 8 chars (1 byte each)
 // map to the same memory space  
 union { double number; char bytes[8]; } value;
 
 sscanf(argv[1],"%lf", &value.number);  // Conv. the first arg. to double 
 
 int i;
 for (i=63;i>-1;i--)                            // Loop over all bits
 {
   if ( (value.bytes[i/8]) & ((char)1<<(i%8)))  // shift and mask (logic and) 
         printf("1"); else printf("0");         // Output if bit is 1 or 0
   if (i%8==0) printf(" ");                     // Output a space to 
 }                                              // divide byte blocks
 
 printf("\n %.10f \n", value.number ); return(0); // print number, return 
}