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View Compilation Error

0_0_28694053_22752.cpp
0_0_28694053_22752.cpp(6) : error C2678: 二进制“<<”: 没有找到接受“std::istream”类型的左操作数的运算符(或没有可接受的转换)
        可能是“内置 C++ operator<<(bool, int)”
        尝试匹配参数列表“(std::istream, int)”时
0_0_28694053_22752.cpp(7) : error C2065: “sum”: 未声明的标识符
0_0_28694053_22752.cpp(8) : error C2065: “sum”: 未声明的标识符


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