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View Compilation Error

0_0_31905493_13521.cpp
0_0_31905493_13521.cpp(31) : error C2374: “mod”: 重定义;多次初始化
        0_0_31905493_13521.cpp(4) : 参见“mod”的声明
0_0_31905493_13521.cpp(33) : error C2084: 函数“int main(void)”已有主体
        0_0_31905493_13521.cpp(5) : 参见“main”的前一个定义


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