Eroare de compilare: user.cpp: In function ‘double distance(double, double, double, double)’: user.cpp:32: error: ‘sqrt’ was not declared in this scope user.cpp: In function ‘int main()’: user.cpp:47: error: ‘stdin’ was not declared in this scope user.cpp:47: error: ‘freopen’ was not declared in this scope user.cpp:48: error: ‘stdout’ was not declared in this scope user.cpp:50: error: ‘scanf’ was not declared in this scope user.cpp:94: error: ‘printf’ was not declared in this scope