Compilare: user.c: In function ‘main’: user.c:122:9: warning: statement with no effect [-Wunused-value] is_good == (check1.size == 0 && check2.size == 0); ^ user.c:52:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%u%*c", &n); ^ user.c: In function ‘init’: user.c:269:1: warning: control reaches end of non-void function [-Wreturn-type] } ^