Compilare: user.c: In function ‘back’: user.c:34:13: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k, set; ^ user.c: In function ‘main’: user.c:82:10: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("sablon.out", "w", stdout); ^ user.c:85:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%s%d", mask, &N); ^ user.c:88:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%s", word); ^