Compilare: user.cpp: In function ‘void convexHull()’: user.cpp:101:6: warning: unused variable ‘m’ [-Wunused-variable] int m = n; ^ user.cpp: In function ‘int main()’: user.cpp:136:9: warning: unused variable ‘xi’ [-Wunused-variable] double xi,yi; ^ user.cpp:136:12: warning: unused variable ‘yi’ [-Wunused-variable] double xi,yi; ^ user.cpp: In function ‘int orientation(Point, Point, Point)’: user.cpp:62:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:133:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("infasuratoare.in","r",stdin); ^ user.cpp:134:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("infasuratoare.out","w",stdout); ^ user.cpp:135:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:142:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf", &points[i].x, &points[i].y); ^