0_0_18308817_767.cpp 0_0_18308817_767.cpp(3) : error C3861: “scanf”: 找不到标识符 0_0_18308817_767.cpp(5) : error C3861: “scanf”: 找不到标识符 0_0_18308817_767.cpp(6) : error C3861: “printf”: 找不到标识符