Compilare: main.c: In function 'main': main.c:13:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in", "rt", stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:14:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out", "wt", stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:17:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%s %s", A, B); ^~~~~~~~~~~~~~~~~~~~