Compilare: user.cpp: In constructor ‘ship::ship(double, double, int, double)’: user.cpp:11:25: warning: ‘ship::val’ will be initialized after [-Wreorder] double a, b, x; int val; ^~~ user.cpp:11:18: warning: ‘double ship::x’ [-Wreorder] double a, b, x; int val; ^ user.cpp:14:5: warning: when initialized here [-Wreorder] ship(double _a, double _b, int _val = -1e5, double _x = -1e5) : ^~~~