Compilare: user.c: In function ‘main’: user.c:22:5: warning: statement with no effect [-Wunused-value] i<<28; ^ user.c:17:25: warning: unused variable ‘k’ [-Wunused-variable] long long int n,i,p,k; ^ user.c:21:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%lld",&n); ^ user.c:26:16: warning: ‘i’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(put5(p+i)<=n) ^