Compilare: user.c: In function ‘main’: user.c:10:23: warning: unused variable ‘x’ [-Wunused-variable] int i,n,j=2,k=1,a=0,x=0; ^ user.c:11:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.c:13:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&v[i]); ^