Eroare de compilare: user.cpp:4:1: error: declaration does not declare anything [-fpermissive] int ; ^ user.cpp:23:47: error: ISO C++ forbids declaration of ‘eg_grad_2’ with no type [-fpermissive] eg_grad_2 (double aa, double bb, double cc) ^ user.cpp: In member function ‘int eq_grad_2::eg_grad_2(double, double, double)’: user.cpp:28:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void Intersectie(cerc, cerc)’: user.cpp:69:7: error: lvalue required as left operand of assignment C = (double)C1 - C2; ^ user.cpp:73:74: error: no matching function for call to ‘eq_grad_2::eq_grad_2(double, double, double)’ (double) C*C / (AA *AA) - 2 * a.xc * C / AA - C1 ) ^ user.cpp:18:7: note: candidate: eq_grad_2::eq_grad_2() class eq_grad_2 ^ user.cpp:18:7: note: candidate expects 0 arguments, 3 provided user.cpp:18:7: note: candidate: constexpr eq_grad_2::eq_grad_2(const eq_grad_2&) user.cpp:18:7: note: candidate expects 1 argument, 3 provided user.cpp:18:7: note: candidate: constexpr eq_grad_2::eq_grad_2(eq_grad_2&&) user.cpp:18:7: note: candidate expects 1 argument, 3 provided user.cpp:75:12: warning: unused variable ‘X1’ [-Wunused-variable] double X1, Y1, X2, Y2; ^ user.cpp:75:20: warning: unused variable ‘X2’ [-Wunused-variable] double X1, Y1, X2, Y2; ^ user.cpp: In function ‘int main()’: user.cpp:85:15: error: ‘n’ was not declared in this scope scanf ("%d", &n); ^ user.cpp:87:19: error: expected primary-expression before ‘)’ token scanf ("%d", &) ^ user.cpp:83:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("cerc.in", "r", stdin); ^ user.cpp:84:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("cerc.out", "w", stdout); ^