View Compilation Error

0_0_18628770_10151.cpp
0_0_18628770_10151.cpp(28) : error C2065: “P”: 未声明的标识符
0_0_18628770_10151.cpp(28) : error C2065: “Q”: 未声明的标识符
0_0_18628770_10151.cpp(29) : error C2065: “w”: 未声明的标识符
0_0_18628770_10151.cpp(29) : error C2065: “v”: 未声明的标识符
0_0_18628770_10151.cpp(30) : error C2059: 语法错误:“return”
0_0_18628770_10151.cpp(31) : error C2059: 语法错误:“}”
0_0_18628770_10151.cpp(31) : error C2143: 语法错误 : 缺少“;”(在“}”的前面)
0_0_18628770_10151.cpp(35) : error C2059: 语法错误:“return”
0_0_18628770_10151.cpp(36) : error C2059: 语法错误:“}”
0_0_18628770_10151.cpp(36) : error C2143: 语法错误 : 缺少“;”(在“}”的前面)
0_0_18628770_10151.cpp(38) : error C2143: 语法错误 : 缺少“;”(在“{”的前面)
0_0_18628770_10151.cpp(38) : error C2447: “{”: 缺少函数标题(是否是老式的形式表?)
0_0_18628770_10151.cpp(66) : error C3861: “SegmentProperIntersection”:  找不到标识符
0_0_18628770_10151.cpp(67) : error C3861: “GetLineIntersection”:  找不到标识符
0_0_18628770_10151.cpp(74) : error C3861: “OnSegment”:  找不到标识符