0_0_22636247_23504.cpp 0_0_22636247_23504.cpp(5) : error C2143: 语法错误 : 缺少“;”(在“>>”的前面) 0_0_22636247_23504.cpp(7) : error C2065: “sum”: 未声明的标识符 0_0_22636247_23504.cpp(8) : error C2065: “sum”: 未声明的标识符