[julia-users] [newb] Trouble with compound Boolean expressions

[yaoismyhero]

Hi,

I am working on a Markov chain Monte Carlo script right now and am trying 
to figure out the parameter generation part of the script. In pseudocode, I 
am trying to do 

a = 0.1
b = 0.1
c = 0.1

function gen()
    a = a + rand()
    b = b + rand()
    c = c + rand()
    if a & b & c >= 0
        return a,b,c 
end 

However, this returns the error message *ERROR: no method &(Float64)*
How do I combine my comparisons and compare floats?

Thanks for your help,
WX