0_0_29240915_12373.cpp 0_0_29240915_12373.cpp(7) : error C2065: “a”: 未声明的标识符 0_0_29240915_12373.cpp(9) : error C2065: “c”: 未声明的标识符 0_0_29240915_12373.cpp(9) : error C2065: “a”: 未声明的标识符 0_0_29240915_12373.cpp(10) : error C2065: “c”: 未声明的标识符