true casea case a action(s) break false true case b case b action(s) break false 8 I true casez case z action(s) break false default action(s) switch多选择结构 ©2006计算机系杨厚群 All rights lefts reserved ©2006 计算机系 杨厚群 All rights & lefts reserved. break break break case a action(s) case b action(s) case z action(s) default action(s) case a case b case z true true true false false false switch 多选择结构