quakeIII源码这个不用我多说吧

				struct foo {
					int a;
					char b;
					int x : 12, y : 4, : 0, : 4, z : 3;
					char c;
				} x = { 1, 2, 3, 4, 5, 6 };
				int i = 16;
				struct baz { unsigned int a:2, b:4, c:32;} y = { 7, 8, 9};
				
				main()
				{
					printf("x = %d %d %d %d %d %d\n", x.a, x.b, x.x, x.y, x.z, x.c);
					printf("y = %d %d %d\n", y.a, y.b, y.c);
					x.y = i;
					x.z = 070;
					printf("x = %d %d %d %d %d %d\n", x.a, x.b, x.x, x.y, x.z, x.c);
					y.a = 2;
					y.c = i;
					printf("y = %d %d %d\n", y.a, y.b, y.c);
					f2(&x);
					return 0;
				}
				
				f1(struct baz *p) {
					p->a = p->b = 0;
					if (p->b)
						printf("p->b != 0!\n");
					p->a = 0x3; p->b = 0xf;
					printf("p->a = 0x%x, p->b = 0x%x\n", p->a, p->b);
				}
				f2(struct baz *p) {
					p->a = (i==0);
					p->b = (f1(p),0);
				}