0_0_38432832_17987.cpp 0_0_38432832_17987.cpp(19) : error C3861: “printf”: 找不到标识符 0_0_38432832_17987.cpp(24) : error C3861: “scanf”: 找不到标识符 0_0_38432832_17987.cpp(27) : error C3861: “scanf”: 找不到标识符