linux下编程用 编译软件

				extern int bar(int);								int foo(int x)				{				  return 1 + bar(					({						int y;						switch (x)						{						case 0: y = 1; break;						case 1: y = 2; break;						case 2: y = 3; break;						case 3: y = 4; break;						case 4: y = 5; break;						case 5: y = 6; break;						default: y = 7; break;						}						y;					})				     );				}