Eroare de compilare: user.cpp: In function ‘int a(int, int, int, int, int, int)’: user.cpp:9:1: error: expected initializer before ‘double’ double p=x1*y2+x2*y3+x3*y1-x3*y2-x1*y3-x2*y1; ^ user.cpp:10:17: error: ‘p’ was not declared in this scope return 0.5*fabs(p); ^ user.cpp: At global scope: user.cpp:12:1: error: expected unqualified-id before ‘{’ token { ^ user.cpp:17:1: error: expected unqualified-id before ‘{’ token { ^ user.cpp:22:5: error: expected unqualified-id before ‘{’ token { ^ user.cpp: In function ‘int main()’: user.cpp:39:30: error: ‘x4’ was not declared in this scope fin>>x1>>y1>>x2>>y2>>x3>>y3>>x4>>y4; ^ user.cpp:39:34: error: ‘y4’ was not declared in this scope fin>>x1>>y1>>x2>>y2>>x3>>y3>>x4>>y4; ^ user.cpp:40:4: error: ‘a1’ was not declared in this scope s+=a1+a2+a3; ^ user.cpp:40:7: error: ‘a2’ was not declared in this scope s+=a1+a2+a3; ^ user.cpp:40:10: error: ‘a3’ was not declared in this scope s+=a1+a2+a3; ^ user.cpp:41:7: error: ISO C++ forbids comparison between pointer and integer [-fpermissive] if(a==s) ^ user.cpp: In function ‘int a(int, int, int, int, int, int)’: user.cpp:11:1: warning: control reaches end of non-void function [-Wreturn-type] } ^