关于地址，指针之间赋值练习

typedef struct{
    int a;
    int b;
}M;

int main(int argc, char *argv[])
{
    M c;
    printf("%d\n",&c);
    M b;
    printf("%d\n",&b);//b的地址
    b = c;//b的值等于c
    printf("%d\n",&b);//b的地址未变

    M* ca = (M*)malloc(sizeof(M));
    ca->a = 3;
    M* ce = (M*)malloc(sizeof(M));
    printf("%d %d  ca ce\n",&ca,&ce);
    ce = ca;//ce的 值(指针地址) 等于ca
    printf("%d %d \n",&ce,ce->a);//ce的地址未变 3

   return 0;
}