0_0_39149500_2534.cpp 0_0_39149500_2534.cpp(15) : error C3861: “scanf”: 找不到标识符 0_0_39149500_2534.cpp(18) : error C3861: “scanf”: 找不到标识符 0_0_39149500_2534.cpp(20) : error C3861: “printf”: 找不到标识符