Compilare: user.c: In function ‘factor’: user.c:25:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(semn==-1) ^ user.c:52:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(semn==-1) ^ user.c: In function ‘main’: user.c:87:20: warning: unused variable ‘n2’ [-Wunused-variable] int n,i,k,j,n1,n2; ^ user.c:89:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("bool.in","r",stdin); ^ user.c:90:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("bool.out","w",stdout); ^ user.c:103:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^