0_0_39203466_15299.cpp 0_0_39203466_15299.cpp(20) : error C2065: “x”: 未声明的标识符 0_0_39203466_15299.cpp(20) : error C2065: “y”: 未声明的标识符 0_0_39203466_15299.cpp(20) : error C2065: “s”: 未声明的标识符