0_0_29434325_15094.cpp 0_0_29434325_15094.cpp(6) : error C2065: “i”: 未声明的标识符 0_0_29434325_15094.cpp(8) : error C2065: “cin”: 未声明的标识符 0_0_29434325_15094.cpp(10) : error C2065: “cout”: 未声明的标识符 0_0_29434325_15094.cpp(12) : error C2065: “cout”: 未声明的标识符