i've read one RNG source code from an article and some of the code are not clear to me. The source code is

proc()

local t;

global seed;

      seed:=irem(a*seed,p);

      t:=seed;

      to concats do seed:=irem(a*seed,p) t:=s*t+seed; end do;

end proc();

i've a problem to understanding the concept of generating random number by using modulo. The basic modulo , let say a:= e mod m and i want to extend it to

x ₀ = given,     x _n+1 = P ₁ x _n + P ₂       (mod N)    n = 0,1,2,...     (*)

But then how to implement that modulo to generate the random generator? and my latpop just 32 bits only. anybody would help me??