Call:    a =  ReadPoly();
    

PolyPointer ReadPoly()
{/*read in the polynomial */
  PolyPointer node,c;
  float coefficient;
  int exponent;

  node = GetNode();
  node->coef = -1.0;
  node->expon = -1;
  node->link = node;
  printf("Enter an exponent < 0 to quit: ");
  printf("\nCoefficient, Exponent: ");
  scanf("%f,%d",&coefficient,&exponent);
  while (exponent >= 0) {
     c = GetNode();
     c->coef =  coefficient; 
     c->expon = exponent;
     c->link = node->link;
     node->link = c;
     printf("Coefficient, Exponent: ");
     scanf("%f,%d",&coefficient,&exponent);
	}
  return node;
}