Compilare: user.c: In function ‘headers’: user.c:10:33: warning: variable ‘ptr2’ set but not used [-Wunused-but-set-variable] char * ptr, * tags, *contain, *ptr2; ^ user.c:19:7: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(ptr, 9999, 1, f); ^ user.c: In function ‘main’: user.c:66:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("convertor.out", "w", stdout); ^