0_0_39290977_1184.cpp 0_0_39290977_1184.cpp(4) : error C3861: “scanf”: 找不到标识符 0_0_39290977_1184.cpp(19) : error C3861: “printf”: 找不到标识符 0_0_39290977_1184.cpp(21) : error C3861: “printf”: 找不到标识符