Compilare: user.c: In function ‘main’: user.c:13:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("tabela.in", "r", stdin); ^ user.c:14:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("tabela.out", "w", stdout); ^ user.c:16:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &L, &C); ^ user.c:32:6: warning: ‘pc’ may be used uninitialized in this function [-Wmaybe-uninitialized] pc >>= 1; ^ user.c:31:6: warning: ‘pl’ may be used uninitialized in this function [-Wmaybe-uninitialized] pl >>= 1; ^