Compilare: user.cpp: In function ‘int main()’: user.cpp:127:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tri.in","r",stdin); ^ user.cpp:128:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tri.out","w",stdout); ^ user.cpp:130:73: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf %lf %lf %lf %lf", &A.x, &A.y, &B.x, &B.y, &C.x, &C.y); ^ user.cpp:131:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:135:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf", &P[i].x, &P[i].y); ^ user.cpp:84:32: warning: ‘l1.Line::a’ may be used uninitialized in this function [-Wmaybe-uninitialized] ans.y = (who.a * c - a * who.c) / sub; ^ user.cpp:277:10: note: ‘l1.Line::a’ was declared here Line l1, l2; ^ user.cpp:83:20: warning: ‘l1.Line::b’ may be used uninitialized in this function [-Wmaybe-uninitialized] ans.x = (b * who.c - who.b * c) / sub; ^ user.cpp:277:10: note: ‘l1.Line::b’ was declared here Line l1, l2; ^ user.cpp:84:24: warning: ‘l1.Line::c’ may be used uninitialized in this function [-Wmaybe-uninitialized] ans.y = (who.a * c - a * who.c) / sub; ^ user.cpp:277:10: note: ‘l1.Line::c’ was declared here Line l1, l2; ^ user.cpp:84:32: warning: ‘l2.Line::c’ may be used uninitialized in this function [-Wmaybe-uninitialized] ans.y = (who.a * c - a * who.c) / sub; ^ user.cpp:277:14: note: ‘l2.Line::c’ was declared here Line l1, l2; ^ user.cpp:83:36: warning: ‘l2.Line::b’ may be used uninitialized in this function [-Wmaybe-uninitialized] ans.x = (b * who.c - who.b * c) / sub; ^ user.cpp:277:14: note: ‘l2.Line::b’ was declared here Line l1, l2; ^ user.cpp:84:24: warning: ‘l2.Line::a’ may be used uninitialized in this function [-Wmaybe-uninitialized] ans.y = (who.a * c - a * who.c) / sub; ^ user.cpp:277:14: note: ‘l2.Line::a’ was declared here