0_0_33258715_2171.cpp 0_0_33258715_2171.cpp(6) : error C3861: “scanf”: 找不到标识符 0_0_33258715_2171.cpp(13) : error C3861: “scanf”: 找不到标识符 0_0_33258715_2171.cpp(31) : error C3861: “printf”: 找不到标识符