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

typedef struct {
    bool b1:1;
    bool b2:1;
    unsigned char ch;
    bool b3:1;
    bool b4:1;
} st1;

typedef struct {
    bool b1;
    bool b2;
    unsigned char c;
    bool b3;
    bool b4;
} st2;


void PrintBinary(unsigned char n )
{
    for ( int i = 7; i >= 0; --i )
    {
        printf("%d", ( n >> i ) & 1);
    }
}

void PrintBool(bool v)
{
    printf( "%s ", v ? "true" : "false" );
}

int main()
{

    st1 s1 = {0};
    st2 s2 = {0};
    unsigned char *p;

    printf( "sizeof s1: %zu\n", sizeof s1 );

    p = (unsigned char *)&s1;

    printf("(A 1): ");

    for ( unsigned int i = 0; i < sizeof s1; ++i )
    {
        PrintBinary( *(p + i) );
        printf(" ");
    }

    printf("\n");

    PrintBool( s1.b1 );
    PrintBool( s1.b2 );
    PrintBool( s1.b3 );
    PrintBool( s1.b4 );
    printf("\n");

    s1.b2 = true;

    printf("(A 2): ");

    for ( unsigned int i = 0; i < sizeof s1; ++i )
    {
        PrintBinary( *(p + i) );
        printf(" ");
    }

    printf("\n");

    PrintBool( s1.b1 );
    PrintBool( s1.b2 );
    PrintBool( s1.b3 );
    PrintBool( s1.b4 );
    printf("\n");

    s1.b3 = true;

    printf("(A 3): ");

    for ( unsigned int i = 0; i < sizeof s1; ++i )
    {
        PrintBinary( *(p + i) );
        printf(" ");
    }

    printf("\n");

    PrintBool( s1.b1 );
    PrintBool( s1.b2 );
    PrintBool( s1.b3 );
    PrintBool( s1.b4 );
    printf("\n");

    printf( "sizeof s2: %zu\n", sizeof s2 );

    p = (unsigned char *)&s2;

    printf("(B 1): ");

    for ( unsigned int i = 0; i < sizeof s2; ++i )
    {
        PrintBinary( *(p + i) );
        printf(" ");
    }

    printf("\n");

    PrintBool( s2.b1 );
    PrintBool( s2.b2 );
    PrintBool( s2.b3 );
    PrintBool( s2.b4 );
    printf("\n");

    s2.b2 = true;

    printf("(B 2): ");

    for ( unsigned int i = 0; i < sizeof s2; ++i )
    {
        PrintBinary( *(p + i) );
        printf(" ");
    }

    printf("\n");

    PrintBool( s2.b1 );
    PrintBool( s2.b2 );
    PrintBool( s2.b3 );
    PrintBool( s2.b4 );
    printf("\n");

    s2.b3 = true;

    printf("(B 3): ");

    for ( unsigned int i = 0; i < sizeof s2; ++i )
    {
        PrintBinary( *(p + i) );
        printf(" ");
    }

    printf("\n");

    PrintBool( s2.b1 );
    PrintBool( s2.b2 );
    PrintBool( s2.b3 );
    PrintBool( s2.b4 );
    printf("\n");

}

/*

output:

sizeof s1: 3
(A 1): 00000000 00000000 00000000
false false false false
(A 2): 00000010 00000000 00000000
false true false false
(A 3): 00000010 00000000 00000001
false true true false
sizeof s2: 5
(B 1): 00000000 00000000 00000000 00000000 00000000
false false false false
(B 2): 00000000 00000001 00000000 00000000 00000000
false true false false
(B 3): 00000000 00000001 00000000 00000001 00000000
false true true false

*/