817646_0_0_18154.c 817646_0_0_18154.c(10) : error C2143: 语法错误 : 缺少“;”(在“类型”的前面) 817646_0_0_18154.c(11) : error C2065: “sum” : 未声明的标识符 817646_0_0_18154.c(12) : error C2065: “i” : 未声明的标识符