0_0_22596060_26019.cpp
0_0_22596060_26019.cpp(8) : error C3861: “triangleArea”: 找不到标识符
0_0_22596060_26019.cpp(12) : error C2065: “Pi”: 未声明的标识符
0_0_22596060_26019.cpp(15) : error C2065: “Pi”: 未声明的标识符
0_0_22596060_26019.cpp(30) : error C3861: “sgn”: 找不到标识符
0_0_22596060_26019.cpp(39) : error C3861: “sgn”: 找不到标识符
0_0_22596060_26019.cpp(42) : error C3861: “sgn”: 找不到标识符
0_0_22596060_26019.cpp(43) : error C2065: “Pi”: 未声明的标识符
0_0_22596060_26019.cpp(46) : error C2065: “Pi”: 未声明的标识符
0_0_22596060_26019.cpp(48) : error C2065: “Pi”: 未声明的标识符
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