I want points to be printed in a coordinate system say one per second - usually I give the points to gnuplot, but this is static- I want them to "move"

How do I get on with this problem ?Code:for(i=0 ; i<=N ; x+=dx , y+=dy , i++) { if(x<-0.99 || x>0.99) dx*=-1.0; if(y<-0.99 || y>0.99) dy*=-1.0; printf("%i %.4f %.4f %.4f\n",i,x,y,sqrt(x*x+y*y)); fprintf(f_ptr,"%i %.4f %.4f %.4f\n",i,x,y,sqrt(x*x+y*y));