0_0_22914711_23311.cpp 0_0_22914711_23311.cpp(6) : error C3861: “scanf”: 找不到标识符 0_0_22914711_23311.cpp(11) : error C3861: “scanf”: 找不到标识符 0_0_22914711_23311.cpp(20) : error C3861: “printf”: 找不到标识符