0_0_22943200_12542.cpp 0_0_22943200_12542.cpp(8) : error C2065: “cin”: 未声明的标识符 0_0_22943200_12542.cpp(11) : error C2065: “cin”: 未声明的标识符 0_0_22943200_12542.cpp(35) : error C2065: “cout”: 未声明的标识符