Compilare: user.cpp: In function ‘int main()’: user.cpp:27:8: warning: variable ‘fi’ set but not used [-Wunused-but-set-variable] FILE *fi, *g; ^ user.cpp:27:13: warning: variable ‘g’ set but not used [-Wunused-but-set-variable] FILE *fi, *g; ^ user.cpp:31:9: warning: unused variable ‘j’ [-Wunused-variable] int i, j, k, n; ^ user.cpp:31:12: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k, n; ^ user.cpp:33:7: warning: unused variable ‘c’ [-Wunused-variable] char c; ^ user.cpp:35:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:36:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%lf %lf", &ax, &ay); ^ user.cpp:39:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%lf %lf", &px, &py); ^ user.cpp:46:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%lf %lf", &x, &y); ^