/* --------------------------------------------------------------------- 
** Figure 18.18: Bitfield-structure demonstration.
** --------------------------------------------------------------------- 
*/
#include <stdio.h>                  

typedef struct DEMO{     
        unsigned int one   : 1 ; 
        unsigned int two   : 3 ;  
        unsigned int three :10 ;     
        unsigned int four  : 5 ;     
        unsigned int       : 2 ;   
        unsigned int five  : 8 ;
        unsigned int six   : 8 ;
} demo_type;     
                
void main( void )            
{  
    int k;            
    unsigned char* bptr;                   
    demo_type bit = { 1, 5, 513, 17, 129, 0x81 };   

    printf( "\n sizeof demo_type = %lu\n", sizeof(demo_type) );  
                   
    printf( " initial values: bit = %u, %u, %u, %u, %u, %u\n", 
           bit.one, bit.two, bit.three, bit.four, bit.five, bit.six ); 
    bptr = (unsigned char*)&bit;             
    printf( " hex dump of bit: %02x %02x %02x %02x %02x %02x\n",  
            bptr[0], bptr[1], bptr[2], bptr[3], bptr[4], bptr[5] ); 

    bit.three = 1023;
    printf( "\n assign 1023 to bit.three: %u, %u, %u, %u, %u, %u\n", 
           bit.one, bit.two, bit.three, bit.four, bit.five, bit.six ); 
    k = bit.two;  
    printf( " assign bit.two to k: k = %u\n", k );                 
}