generate function to print out a random number using different input arguments? - Homework

Write a function that will print out a random float number:

If no input arguments are passed it will print a random number from 0 to 1

If one input argument is passed then that argument is the max and the random number will be from zero to max

If two arguments are passed, then they represent the min and max for the random number

This is what I have so far:

function [num] ranum( a,b )

fprintf('There is/are %d input argument.\n', nargin);

for i=1:nargin-1

    if i == 0
        num = rand(1);

    end
end

I am not sure how to make the input arguments min and max for when the input is the other two conditions.

[sixwwwwww]

What you will do if user don't input a or b? then how you will check the condition?