#include <stdio.h>

struct s1
{
    int a : 1;
    int b : 1;
};

struct s2
{
    int a : 20;
    int b : 12;
};

struct s3
{
    int a : 20;
    int b : 13;
};

/*************/
struct x1
{
    char a : 1;
    int b : 1;
};

struct x2
{
    char a : 1;
    int b : 8;
};

 
struct x3
{
    char a : 8;
    int b : 32;
};

int main()
{ 
    printf("%d, %d, %d\n", sizeof(struct s1), sizeof(struct s2), sizeof(struct s3));
    printf("%d, %d, %d\n", sizeof(struct x1), sizeof(struct x2), sizeof(struct x3)); 
}