Compilare: user.cpp: In function ‘double solve(double, double, double, double)’: user.cpp:16:17: warning: variable ‘l3’ set but not used [-Wunused-but-set-variable] double l1, l2, l3; ^ user.cpp:17:9: warning: unused variable ‘s’ [-Wunused-variable] double s; ^ user.cpp:18:9: warning: unused variable ‘area’ [-Wunused-variable] double area; ^ user.cpp: In function ‘int main()’: user.cpp:44:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("distanta.in", "r", stdin); ^ user.cpp:45:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("distanta.out", "w", stdout); ^ user.cpp:47:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ user.cpp:52:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf %lf %lf", &a, &b, &xi, &yi); ^