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View Compilation Error

0_0_39933126_20334.cpp
0_0_39933126_20334.cpp(13) : error C2146: 语法错误: 缺少“;”(在标识符“string”的前面)
0_0_39933126_20334.cpp(13) : error C2146: 语法错误: 缺少“;”(在标识符“num_str”的前面)
0_0_39933126_20334.cpp(13) : error C2275: “std::string”: 将此类型用作表达式非法
        VC2013\INCLUDE\xstring(2643) : 参见“std::string”的声明
0_0_39933126_20334.cpp(13) : error C2065: “num_str”: 未声明的标识符
0_0_39933126_20334.cpp(14) : error C2065: “num_str”: 未声明的标识符
0_0_39933126_20334.cpp(16) : error C2065: “num_str”: 未声明的标识符
0_0_39933126_20334.cpp(16) : error C2228: “.length”的左边必须有类/结构/联合
        类型是“unknown-type”
0_0_39933126_20334.cpp(20) : error C2065: “num_str”: 未声明的标识符
0_0_39933126_20334.cpp(20) : error C2228: “.length”的左边必须有类/结构/联合
        类型是“unknown-type”
0_0_39933126_20334.cpp(22) : error C2065: “num_str”: 未声明的标识符
0_0_39933126_20334.cpp(26) : error C2065: “num_str”: 未声明的标识符
0_0_39933126_20334.cpp(29) : error C2065: “num_str”: 未声明的标识符
0_0_39933126_20334.cpp(33) : error C2065: “num_str”: 未声明的标识符
0_0_39933126_20334.cpp(35) : error C2065: “num_str”: 未声明的标识符
0_0_39933126_20334.cpp(41) : error C2065: “num_str”: 未声明的标识符
0_0_39933126_20334.cpp(44) : error C2065: “num_str”: 未声明的标识符


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