C语言位段与联合体（union)的内存分配

 union V {struct X {   unsigned char s1:1;   unsigned char s2:1;   unsigned char s3:4;} x;        unsigned char s1:1;unsigned char s2:1;unsigned char s3:4;int c;} v;void main(){      v.c = 100;  //0110 0100    printf("%d", v.x.s3); //9      内存从左到右依次分配printf("%d", v.s3);  //4内存都从最右边同一位置开始分配（共用）system("pause");}