Compilare: user.c: In function ‘nextch’: user.c:10:10: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, in); ^ user.c: In function ‘main’: user.c:50:10: warning: ‘len’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(out, "%d %d %d", smax, st + 1, len + 1); ^ user.c:50:10: warning: ‘st’ may be used uninitialized in this function [-Wmaybe-uninitialized]