Compilare: main.c: In function 'main': main.c:36:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in","r",stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:37:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out","w",stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:41:5: warning: ignoring return value of 'fgets', declared with attribute warn_unused_result [-Wunused-result] fgets(A+1,LSir,stdin); ^~~~~~~~~~~~~~~~~~~~~ main.c:42:5: warning: ignoring return value of 'fgets', declared with attribute warn_unused_result [-Wunused-result] fgets(B+1,LSir,stdin); ^~~~~~~~~~~~~~~~~~~~~ In file included from /usr/include/stdio.h:936:0, from main.c:1: In function 'fgets', inlined from 'main' at main.c:41:5: /usr/include/x86_64-linux-gnu/bits/stdio2.h:261:9: warning: call to '__fgets_chk_warn' declared with attribute warning: fgets called with bigger size than length of destination buffer return __fgets_chk_warn (__s, __bos (__s), __n, __stream); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In function 'fgets', inlined from 'main' at main.c:42:5: /usr/include/x86_64-linux-gnu/bits/stdio2.h:261:9: warning: call to '__fgets_chk_warn' declared with attribute warning: fgets called with bigger size than length of destination buffer return __fgets_chk_warn (__s, __bos (__s), __n, __stream); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~