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View Compilation Error

0_0_39833319_20106.cpp
0_0_39833319_20106.cpp(9) : error C2065: “NULL”: 未声明的标识符
0_0_39833319_20106.cpp(28) : error C2065: “NULL”: 未声明的标识符
0_0_39833319_20106.cpp(36) : error C2065: “NULL”: 未声明的标识符
0_0_39833319_20106.cpp(44) : error C2065: “NULL”: 未声明的标识符
0_0_39833319_20106.cpp(52) : error C2065: “NULL”: 未声明的标识符
0_0_39833319_20106.cpp(60) : error C3861: “scanf”:  找不到标识符
0_0_39833319_20106.cpp(61) : error C2065: “cin”: 未声明的标识符
0_0_39833319_20106.cpp(62) : error C2065: “cin”: 未声明的标识符
0_0_39833319_20106.cpp(69) : error C3861: “printf”:  找不到标识符


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