Compilare: user.c: In function ‘init’: user.c:29:5: warning: array subscript has type ‘char’ [-Wchar-subscripts] code[c] = curr++; ^ user.c:32:5: warning: array subscript has type ‘char’ [-Wchar-subscripts] code[c] = curr++; ^ user.c:35:5: warning: array subscript has type ‘char’ [-Wchar-subscripts] code[c] = curr++; ^ user.c: In function ‘main’: user.c:82:5: warning: array subscript has type ‘char’ [-Wchar-subscripts] append(&find, code[p[i]]); ^ user.c:85:5: warning: array subscript has type ‘char’ [-Wchar-subscripts] append(&search, code[s[i]]); ^ user.c:88:5: warning: array subscript has type ‘char’ [-Wchar-subscripts] append(&search, code[s[i]]); ^ user.c:90:5: warning: array subscript has type ‘char’ [-Wchar-subscripts] erase(&search, code[s[i - lim]]); ^ user.c:75:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%s%s", p, s); ^ user.c:93:10: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out", "w", stdout); ^