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View Compilation Error

0_0_21203192_31650.cpp
0_0_21203192_31650.cpp(8) : error C2668: “sqrt”: 对重载函数的调用不明确
        VC2013\INCLUDE\math.h(1251): 可能是“long double sqrt(long double) throw()”
        VC2013\INCLUDE\math.h(1135): 或       “float sqrt(float) throw()”
        VC2013\INCLUDE\math.h(521): 或       “double sqrt(double)”
        尝试匹配参数列表“(int)”时
0_0_21203192_31650.cpp(45) : error C2065: “cin”: 未声明的标识符
0_0_21203192_31650.cpp(51) : error C2065: “cin”: 未声明的标识符
0_0_21203192_31650.cpp(60) : error C2065: “cout”: 未声明的标识符
0_0_21203192_31650.cpp(60) : error C2065: “endl”: 未声明的标识符


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