Compilare: user.cpp: In function ‘int main()’: user.cpp:27:9: warning: unused variable ‘pos_l’ [-Wunused-variable] int pos_l = l % 8, pos_c = c % 8; ^ user.cpp:27:24: warning: unused variable ‘pos_c’ [-Wunused-variable] int pos_l = l % 8, pos_c = c % 8; ^ user.cpp:7:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tabela.in", "r", stdin); ^ user.cpp:8:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tabela.out", "w", stdout); ^ user.cpp:11:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &l, &c); ^