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");
}