How can do this?

I need to do an exercise where i ask the USER for positive numbers, and while the number is positive i need to keep asking the USER for positive numbers. Then i need to do a sum of those positive numbers e show how many positive numbers the USER typed. This is my code thus far:

numero=input('Enter positive number')

while numero>=0

x=input('Enter another positive number')

end

w=[numero,x];

u=numel(w);

v=sum(w);

break

end

fprintf('Total positive numbers is %f\n',u)

fprintf('The sum is %f\n',v)

The problem is i can only enter 2 numbers and then it gives me the asnwer right away .HELP

Answer 1

[Jan]

n = [];
while 1
    x = input('Enter a positive number: ')
    if x < 0   % or <= ?
        break;
    end
    n = [n, x];
end
fprintf('Total positive numbers is %f\n', numel(n))
fprintf('The sum is %f\n', sum(n))

Answer 2

[David Hill]

c=1;
while 1
  n(c)=input('Enter positive number');
  if n(c)<0
      n=n(1:end-1);
      break;
  end
  c=c+1;
end
fprintf('Total positive numbers is %f\n',numel(n));
fprintf('The sum is %f\n',sum(n));