Curves

How do you draw a curve in cg?? I put the #'s in the way the book said, but
get no curve plotted on screen. Is there something I'm missing???
get no curve plotted on screen. Is there something I'm missing???
How do you draw a curve in cg?? I put the #'s in the way the book said,
but
get no curve plotted on screen. Is there something I'm missing???