0_0_39344039_19597.cpp 0_0_39344039_19597.cpp(10) : error C2065: “cin”: 未声明的标识符 0_0_39344039_19597.cpp(12) : error C3861: “scanf”: 找不到标识符 0_0_39344039_19597.cpp(36) : error C3861: “printf”: 找不到标识符