0_0_19485991_22769.cpp 0_0_19485991_22769.cpp(28) : error C2065: “flag”: 未声明的标识符 0_0_19485991_22769.cpp(33) : error C2065: “flag”: 未声明的标识符 0_0_19485991_22769.cpp(38) : error C2065: “flag”: 未声明的标识符