Compilare: user.cpp: In function ‘int main()’: user.cpp:40:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tarc.in", "r", stdin); ^ user.cpp:41:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tarc.out", "w", stdout); ^ user.cpp:43:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ user.cpp:47:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:53:46: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf", &v[i].x, &v[i].y); ^ user.cpp:131:22: warning: ‘p4.punct::y’ may be used uninitialized in this function [-Wmaybe-uninitialized] ans4.y = p4.y; ^ user.cpp:127:22: warning: ‘p3.punct::y’ may be used uninitialized in this function [-Wmaybe-uninitialized] ans2.y = p3.y; ^ user.cpp:130:22: warning: ‘p1.punct::x’ may be used uninitialized in this function [-Wmaybe-uninitialized] ans4.x = p1.x; ^ user.cpp:128:22: warning: ‘p2.punct::x’ may be used uninitialized in this function [-Wmaybe-uninitialized] ans3.x = p2.x; ^