How many bins are created and bins are covered, Here the percentage is 43.750000%? and why?

Coverage
1 
module sdcsc;
  bit  a;
  bit  b;
  
  covergroup cg;
    A: coverpoint a;
    B: coverpoint b;
    Axb: cross A,b;
  endgroup
  
  cg c;
  initial
    begin
      c=new();
          a=$urandom;
          b=$urandom;
          $display("a=%0d    b=%0d",a,b);
          c.sample();
          $display("coverage=%0f",c.get_coverage);
    end
endmodule

OUTPUT:
a=0 b=0
coverage=43.750000

2

In reply to shravan.v:

Since you crossed uppercase A with lowercase b, a third implicit coverpoint gets created for the variable b. Each coverpoint will have 2 bins, and the cross will have 4 bins. So the resulting coverage is

( 1/2 + 1/2 + 1/2 + 1/4 )/ 4 = 0.4375

3

covergroup cg;
A: coverpoint a;
B: coverpoint b;
AxB: cross A,B;
endgroup

initial
begin
a=0; b=0;
c.sample;
end

Now, what will be the difference before snippet and this snippet. In both, coverage is same.

4

Can you explain in detail?

5

In reply to shravan.v:

In both, coverage is same.

Have you tried your 2nd code ?

what will be the difference before snippet and this snippet

In 2nd case resulting coverage is :

( 1/2 + 1/2 + 1/4 )/ 3 = 0.4166
6

Thanks MICRO_91

7

In reply to dave_59:

Thanks dave_59