0_0_35057960_27285.cpp 0_0_35057960_27285.cpp(4) : error C2065: “a”: 未声明的标识符 0_0_35057960_27285.cpp(4) : error C2065: “b”: 未声明的标识符 0_0_35057960_27285.cpp(5) : error C2065: “a”: 未声明的标识符 0_0_35057960_27285.cpp(5) : error C2065: “b”: 未声明的标识符