Compilare: main.cpp: In function 'int main()': main.cpp:11:29: warning: format '%lf' expects argument of type 'double*', but argument 2 has type 'long double*' [-Wformat=] scanf("%lf%lf", &x1, &y1); ^ main.cpp:11:29: warning: format '%lf' expects argument of type 'double*', but argument 3 has type 'long double*' [-Wformat=] main.cpp:15:33: warning: format '%lf' expects argument of type 'double*', but argument 2 has type 'long double*' [-Wformat=] scanf("%lf%lf", &x2, &y2); ^ main.cpp:15:33: warning: format '%lf' expects argument of type 'double*', but argument 3 has type 'long double*' [-Wformat=] main.cpp:23:22: warning: format '%lf' expects argument of type 'double', but argument 2 has type 'long double' [-Wformat=] printf("%.6lf", a); ^ main.cpp:6:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("aria.in", "r",stdin); ^ main.cpp:7:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("aria.out", "w",stdout); ^ main.cpp:10:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:11:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf", &x1, &y1); ^ main.cpp:15:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf", &x2, &y2); ^