0_0_13656262_20148.cpp
0_0_13656262_20148.cpp(38) : error C2065: “mat_a”: 未声明的标识符
0_0_13656262_20148.cpp(41) : error C2065: “mat_b”: 未声明的标识符
0_0_13656262_20148.cpp(45) : error C2065: “mat_a”: 未声明的标识符
0_0_13656262_20148.cpp(45) : error C2065: “mat_b”: 未声明的标识符
0_0_13656262_20148.cpp(46) : error C2065: “mat_c”: 未声明的标识符
0_0_13656262_20148.cpp(50) : error C2065: “mat_c”: 未声明的标识符
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