c 编译异常 switch 之a label can only be part of a statement and a declaration is not a statement

client.c:996: error: a label can only be part of a statement and a declaration is not a statement

switch(a){case 1:............................................................break;case 2:break;}　在GCC下编译会出现如下错误：error: a label can only be part of a statement and a declaration is not a statement但加上如下括号后，就没有错误了，这是为什么？编译器的问题？switch(a){case 1:｛............................................................｝break;case 2:break;}http://zhidao.baidu.com/link?url=fSrpX7VaVXd5-L8c2zj2xVDSbh8bM-5xyO6iyZOYgV30mI_iZlASQmNakmGSC-4gnPO3oG2HzIAvdSVayOTjTahttp://www.cnblogs.com/radiolover/p/4307453.html 手机定位http://www.cnblogs.com/skyme/p/4310550.html 数据挖掘