0_0_24640203_7594.cpp 0_0_24640203_7594.cpp(2) : error C2065: “n”: 未声明的标识符 0_0_24640203_7594.cpp(3) : error C2448: “SUM”: 函数样式初始值设定项类似函数定义 0_0_24640203_7594.cpp(15) : error C3861: “SUM”: 找不到标识符