0_0_5907100_1405.c 0_0_5907100_1405.c(21) : error C2143: 语法错误 : 缺少“;”(在“类型”的前面) 0_0_5907100_1405.c(22) : error C2065: “sum” : 未声明的标识符 0_0_5907100_1405.c(22) : error C2065: “c” : 未声明的标识符