#include<stdio.h>
//#pragma pack(1)
struct AA{
    unsigned char a:3; //LSB
    unsigned short b:5;
    unsigned int c:9; //MSB
}aa;
//#pragma pack()
int main(){
    aa.a = 7;
    aa.b = 31;
    aa.c = 511;
 
    unsigned char * ptr = (unsigned char *)&aa;
    for(int i=0; i< sizeof(aa); i++){
        printf("%p   %x\n", ptr, *ptr);
        ptr++; 
    }
 
    printf("%d %d %d %d\n", sizeof(int), sizeof(char), sizeof(short), sizeof(aa));
}

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