Compilare: user.c: In function ‘main’: user.c:9:23: warning: unused variable ‘j’ [-Wunused-variable] int i,n,m,k,c1,c2,j; ^ user.c:9:20: warning: unused variable ‘c2’ [-Wunused-variable] int i,n,m,k,c1,c2,j; ^ user.c:9:17: warning: unused variable ‘c1’ [-Wunused-variable] int i,n,m,k,c1,c2,j; ^ user.c:10:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d %d\n",&n,&m,&k); ^ user.c:13:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d",&x[i],&y[i]); ^