Compilare: user.cpp: In function ‘int main()’: user.cpp:28:8: warning: variable ‘f’ set but not used [-Wunused-but-set-variable] FILE *f, *g; ^ user.cpp:28:12: warning: variable ‘g’ set but not used [-Wunused-but-set-variable] FILE *f, *g; ^ user.cpp:33:9: warning: unused variable ‘j’ [-Wunused-variable] int i, j, k, n; ^ user.cpp:33:12: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k, n; ^ user.cpp:34:7: warning: unused variable ‘c’ [-Wunused-variable] char c; ^ user.cpp:37:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:40:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^