Compilare: user.cpp: In function ‘void spirala(int)’: user.cpp:29:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, s, t, d, k, L, K; ^ user.cpp:29:15: warning: unused variable ‘s’ [-Wunused-variable] int i, j, s, t, d, k, L, K; ^ user.cpp:29:21: warning: unused variable ‘d’ [-Wunused-variable] int i, j, s, t, d, k, L, K; ^ user.cpp: In function ‘int main()’: user.cpp:71:12: warning: unused variable ‘k’ [-Wunused-variable] int n, k, i, j, s, t, d, ok, ma; ^ user.cpp:71:21: warning: unused variable ‘s’ [-Wunused-variable] int n, k, i, j, s, t, d, ok, ma; ^ user.cpp:68:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spirala2.in","r",stdin); ^ user.cpp:69:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spirala2.out","w",stdout); ^ user.cpp:74:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^