Compilare: user.c: In function ‘main’: user.c:9:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,n,a,b,d; ^ user.c:10:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&n); ^ user.c:27:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d",&a,&b); ^