0_0_13456793_23094.cpp 0_0_13456793_23094.cpp(18) : error C2065: “c”: 未声明的标识符 0_0_13456793_23094.cpp(20) : error C2065: “c”: 未声明的标识符 0_0_13456793_23094.cpp(21) : error C2065: “c”: 未声明的标识符