0_0_16532884_29103.cpp 0_0_16532884_29103.cpp(36) : error C2065: “sum1”: 未声明的标识符 0_0_16532884_29103.cpp(39) : error C2065: “sum1”: 未声明的标识符 0_0_16532884_29103.cpp(41) : error C2065: “sum1”: 未声明的标识符