0_0_26172564_14010.c 0_0_26172564_14010.c(9) : error C2065: “sum”: 未声明的标识符 0_0_26172564_14010.c(10) : error C2065: “sum”: 未声明的标识符 0_0_26172564_14010.c(11) : error C2065: “sum”: 未声明的标识符 0_0_26172564_14010.c(14) : error C2065: “bresk”: 未声明的标识符