0_0_39213073_656.cpp 0_0_39213073_656.cpp(9) : error C3861: “scanf”: 找不到标识符 0_0_39213073_656.cpp(12) : error C3861: “scanf”: 找不到标识符 0_0_39213073_656.cpp(13) : error C3861: “printf”: 找不到标识符