0_0_18308795_27541.cpp 0_0_18308795_27541.cpp(3) : error C3861: “scanf”: 找不到标识符 0_0_18308795_27541.cpp(5) : error C3861: “scanf”: 找不到标识符 0_0_18308795_27541.cpp(6) : error C3861: “printf”: 找不到标识符