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View Compilation Error

0_0_34545803_17567.c
0_0_34545803_17567.c(4) : error C2086: “double x1”: 重定义
        0_0_34545803_17567.c(4) : 参见“x1”的声明
0_0_34545803_17567.c(4) : error C2086: “double y2”: 重定义
        0_0_34545803_17567.c(4) : 参见“y2”的声明
0_0_34545803_17567.c(6) : error C2065: “y1”: 未声明的标识符
0_0_34545803_17567.c(6) : error C2065: “x2”: 未声明的标识符
0_0_34545803_17567.c(8) : error C2065: “x2”: 未声明的标识符
0_0_34545803_17567.c(8) : error C2065: “y1”: 未声明的标识符


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