0_0_39709007_10551.cpp 0_0_39709007_10551.cpp(29) : error C2065: “sum_v”: 未声明的标识符 0_0_39709007_10551.cpp(32) : error C2065: “sum_v”: 未声明的标识符 0_0_39709007_10551.cpp(32) : error C2065: “sum_n”: 未声明的标识符