810804_0_0_5086.cpp 810804_0_0_5086.cpp(2) : error C2059: 语法错误 : “;” 810804_0_0_5086.cpp(6) : error C2065: “cin” : 未声明的标识符 810804_0_0_5086.cpp(17) : error C2065: “cout” : 未声明的标识符