Compilare: user.c: In function ‘main’: user.c:18:16: warning: unused variable ‘s’ [-Wunused-variable] int n,i=0,k,l,s=0; fscanf(f,"%d",&n); ^ user.c:18:14: warning: unused variable ‘l’ [-Wunused-variable] int n,i=0,k,l,s=0; fscanf(f,"%d",&n); ^ user.c:18:27: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] int n,i=0,k,l,s=0; fscanf(f,"%d",&n); ^ user.c:21:24: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] for(i=0;i<n;i++)fscanf(f,"%lu",&v[i]); ^