Compilare: user.c: In function ‘main’: user.c:55:39: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int a[900],i,j,n,nr=0,s=0,k=0,z=0,ok; ^ user.c:55:35: warning: unused variable ‘z’ [-Wunused-variable] int a[900],i,j,n,nr=0,s=0,k=0,z=0,ok; ^ user.c:59:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.c:61:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&a[i]); ^