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2_30942_2454851_21580.cpp 2_30942_2454851_21580.cpp(12) : error C2065: “cin”: 未声明的标识符 2_30942_2454851_21580.cpp(36) : error C2065: “num1”: 未声明的标识符
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2_30942_2454851_21580.cpp 2_30942_2454851_21580.cpp(12) : error C2065: “cin”: 未声明的标识符 2_30942_2454851_21580.cpp(36) : error C2065: “num1”: 未声明的标识符