%function with 3 parameters which returns nothing-gives geometric info 
% abt a parabola
function parabinfo(a,b,c)
if (a>0)
    disp('right side up-holds water');
elseif(a<0)
    disp('up side down-spills water');
else
    disp('just a line');
end;
discr=b*b-4*a*c;
if(discr < 0)
    disp('no zeros');
elseif(discr > 0)
    disp('two zeros');
else
    disp('one zero');
end;