Compilare: main.cpp: In function 'POINT get_P(double, double, double, POINT, POINT, POINT, double)': main.cpp:34:20: warning: unused variable 'x1' [-Wunused-variable] double delta , x1 , x2; ^~ main.cpp:34:25: warning: unused variable 'x2' [-Wunused-variable] double delta , x1 , x2; ^~ main.cpp: In function 'int main()': main.cpp:55:21: warning: unused variable 'j' [-Wunused-variable] int t , n , i , j; ^ main.cpp:53:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("expand.in" , "r" , stdin); ^ main.cpp:54:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("expand.out" , "w" , stdout); ^ main.cpp:57:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%lf" , &t , &n , &d); ^ main.cpp:60:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf" , &x , &y); ^